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Any calculation inside brackets is completed before indices, multiplication, division, addition or subtraction."},{"text":"Bases.","correct":false,"explanation":"A base is the number raised to a power, which may appear when working with indices. The B in BIDMAS stands for brackets."},{"text":"Binomials.","correct":false,"explanation":"A binomial is an algebraic expression containing two terms, not a stage in the order of operations. The B in BIDMAS stands for brackets."},{"text":"Bisectors.","correct":false,"explanation":"Bisectors divide angles or lines into equal parts and are unrelated to the order of operations. The B in BIDMAS stands for brackets."}]},{"id":"4b98fe3a-8b81-8301-f450-c81fe4666a91","cardType":"basic","points":1,"front":"What does the I in BIDMAS stand for?","back":"Indices.","mcqOptions":[{"text":"Indices.","correct":true,"explanation":"The I in BIDMAS stands for indices, meaning powers such as squares and cubes. Indices are evaluated after brackets but before the four basic operations."},{"text":"Inverses.","correct":false,"explanation":"Inverse operations undo one another, but they are not represented by I in BIDMAS. The I stands for indices, which are powers such as squares and cubes."},{"text":"Integers.","correct":false,"explanation":"Integers are whole numbers, including positive numbers, negative numbers and zero. They are not an operation in BIDMAS; the I stands for indices."},{"text":"Inequalities.","correct":false,"explanation":"Inequalities compare quantities using symbols such as $<$ and $>$. They are not part of the BIDMAS order; the I stands for indices."}]},{"id":"b065aed9-b43e-eb6a-3487-7b01717b7013","cardType":"basic","points":1,"front":"In BIDMAS, what must be done before everything else?","back":"Brackets.","mcqOptions":[{"text":"Brackets.","correct":true,"explanation":"Calculations inside brackets are completed first because brackets can change how the rest of an expression is grouped. Indices and the other operations follow afterwards."},{"text":"Indices.","correct":false,"explanation":"Indices come before multiplication, division, addition and subtraction, but not before brackets. Calculations inside brackets must be completed first."},{"text":"Multiplication.","correct":false,"explanation":"Multiplication is completed after brackets and indices. Choosing it first overlooks the opening stages of BIDMAS, so brackets must be handled before everything else."},{"text":"Addition.","correct":false,"explanation":"Reading an expression from left to right can make addition seem first, but BIDMAS takes priority. Brackets must be completed before all other operations."}]},{"id":"7314c511-6273-2899-b09d-e73871f320bb","cardType":"basic","points":1,"front":"In BIDMAS, what comes after brackets?","back":"Indices.","mcqOptions":[{"text":"Indices.","correct":true,"explanation":"Indices are evaluated immediately after brackets in BIDMAS. This includes powers such as squares and cubes, which come before multiplication and division."},{"text":"Division.","correct":false,"explanation":"Division has equal priority with multiplication, but both come after indices. Once brackets are completed, the next BIDMAS stage is indices."},{"text":"Multiplication.","correct":false,"explanation":"Multiplication does not follow brackets immediately because indices must be evaluated first. Multiplication and division are handled only after brackets and indices."},{"text":"Addition.","correct":false,"explanation":"Addition is one of the final BIDMAS operations, alongside subtraction. Indices come directly after brackets and before multiplication, division, addition and subtraction."}]},{"id":"feb29a22-df1f-7b04-e476-8fbd9d5d7f4e","cardType":"cloze","points":null,"front":"In BIDMAS, multiplication and [ ] have equal priority.","back":"In BIDMAS, multiplication and division have equal priority.","mcqOptions":[{"text":"division","correct":true,"explanation":"Multiplication and division have equal priority in BIDMAS. When both occur in the same expression, they are completed from left to right."},{"text":"addition","correct":false,"explanation":"Addition has lower priority than multiplication and is paired with subtraction instead. Multiplication has equal priority with division, and those operations are handled first."},{"text":"subtraction","correct":false,"explanation":"Subtraction has equal priority with addition, not multiplication. In BIDMAS, multiplication and division form the equal-priority pair."},{"text":"indices","correct":false,"explanation":"Indices have higher priority than multiplication and are completed before it. Multiplication instead has equal priority with division."}]},{"id":"1d6e22cb-1b5e-e5fb-2ebe-f345b794578a","cardType":"cloze","points":null,"front":"In BIDMAS, addition and [ ] have equal priority.","back":"In BIDMAS, addition and subtraction have equal priority.","mcqOptions":[{"text":"subtraction","correct":true,"explanation":"Addition and subtraction have equal priority in BIDMAS. If both appear, they are completed from left to right after higher-priority operations."},{"text":"division","correct":false,"explanation":"Division has equal priority with multiplication and is completed before addition. Addition is paired with subtraction at the final BIDMAS stage."},{"text":"multiplication","correct":false,"explanation":"Multiplication has higher priority than addition and is paired with division. Addition has equal priority with subtraction, which is handled from left to right."},{"text":"indices","correct":false,"explanation":"Indices are completed before addition and therefore do not have equal priority with it. Addition and subtraction share the same priority."}]},{"id":"4aaeb3df-4ef0-44a7-49f5-df2a568c8402","cardType":"basic","points":1,"front":"If a calculation has only one operation, how do you work it out?","back":"Work it out normally.","mcqOptions":[{"text":"Work it out normally.","correct":true,"explanation":"With only one operation to perform, there is no conflict for BIDMAS to resolve. Apply that operation normally to the numbers given."},{"text":"Work it out backwards.","correct":false,"explanation":"Reversing the calculation can change the result, especially for subtraction and division. With only one operation, apply that operation normally in the order shown."},{"text":"Work it out using the inverse.","correct":false,"explanation":"An inverse operation undoes the stated operation rather than carrying it out. When only one operation is present, perform that operation normally."},{"text":"Work it out as multiplication.","correct":false,"explanation":"Multiplication should not replace whichever operation is actually shown. A calculation containing only one operation is worked out normally using that stated operation."}]},{"id":"9c404ac3-f829-d14b-b8c4-551113ddf148","cardType":"basic","points":1,"front":"Which operation is done first in $3 + 6 \\times 4$?","back":"$6 \\times 4$.","mcqOptions":[{"text":"$6 \\times 4$.","correct":true,"explanation":"Multiplication has higher priority than addition in BIDMAS, so $6 \\times 4$ is calculated first. The result is then added to $3$."},{"text":"$3 + 6$.","correct":false,"explanation":"Working strictly from left to right ignores BIDMAS. Multiplication has priority over addition, so $6 \\times 4$ must be completed first."},{"text":"$6 + 4$.","correct":false,"explanation":"The operation between $6$ and $4$ is multiplication, not addition. BIDMAS therefore requires $6 \\times 4$ to be completed first."},{"text":"$3 \\times 4$.","correct":false,"explanation":"The numbers $3$ and $4$ are not joined by a multiplication sign in the expression. The stated multiplication, $6 \\times 4$, is completed first."}]},{"id":"fab584e3-b8e0-140f-37f4-0f2a91b17ba1","cardType":"basic","points":2,"front":"Work out $3 + 6 \\times 4$.","back":"$27$.","mcqOptions":[{"text":"$27$.","correct":true,"explanation":"Multiplication is completed before addition under BIDMAS. Calculate $6 \\times 4 = 24$, then add $3$ to obtain $27$."},{"text":"$36$.","correct":false,"explanation":"Adding $3 + 6$ before multiplying ignores the BIDMAS order and gives $9 \\times 4 = 36$. Multiplication must come first, giving $3 + 24 = 27$."},{"text":"$33$.","correct":false,"explanation":"This can result from incorrectly calculating $6 \\times 4$ as $30$. The product is $24$, so the calculation becomes $3 + 24 = 27$."},{"text":"$13$.","correct":false,"explanation":"This treats the multiplication sign as though it contributes only the separate numbers. BIDMAS requires $6 \\times 4 = 24$ first, followed by $3 + 24 = 27$."}]},{"id":"cda13fcb-0880-4edc-80d8-800779df764b","cardType":"cloze","points":null,"front":"Brackets show the part of a calculation that must be done [ ].","back":"Brackets show the part of a calculation that must be done first.","mcqOptions":[{"text":"first","correct":true,"explanation":"BIDMAS places brackets before indices, division, multiplication, addition and subtraction. Any calculation enclosed by brackets must therefore be completed before operations outside them."},{"text":"last","correct":false,"explanation":"Treating brackets as the final step reverses their purpose. BIDMAS gives brackets the highest priority, so the calculation inside them must be completed first."},{"text":"second","correct":false,"explanation":"Brackets do not wait until after another operation has been performed. They come first in BIDMAS, before indices and all the ordinary arithmetic operations."},{"text":"separately","correct":false,"explanation":"Although brackets group part of a calculation, their key instruction is about order rather than merely separation. The operations inside brackets must be completed first."}]},{"id":"111287c4-0130-37ae-ab53-aa569faa794b","cardType":"basic","points":1,"front":"Which part is worked out first in $(9 - 4) \\times 3$?","back":"$9 - 4$.","mcqOptions":[{"text":"$9 - 4$.","correct":true,"explanation":"BIDMAS requires the calculation inside the brackets to be completed first. The subtraction $9 - 4$ is therefore evaluated before multiplying its result by $3$."},{"text":"$4 \\times 3$.","correct":false,"explanation":"Multiplying $4$ by $3$ first ignores the brackets and changes the calculation. BIDMAS requires the enclosed subtraction $9 - 4$ to be worked out first."},{"text":"$9 \\times 3$.","correct":false,"explanation":"The multiplier $3$ applies to the result of the entire bracket, not just to $9$. The subtraction $9 - 4$ must be completed first."},{"text":"$9 - 3$.","correct":false,"explanation":"This incorrectly combines numbers from inside and outside the brackets. The bracket contains $9 - 4$, and that complete subtraction must be worked out first."}]},{"id":"113cd026-c43a-f9c4-e634-5e11d5079052","cardType":"basic","points":2,"front":"Work out $(9 - 4) \\times 3$.","back":"$15$.","mcqOptions":[{"text":"$15$.","correct":true,"explanation":"Complete the brackets first: $9 - 4 = 5$. Then perform the multiplication, giving $5 \\times 3 = 15$."},{"text":"$23$.","correct":false,"explanation":"This comes from multiplying $4 \\times 3$ first and then subtracting from $9$ incorrectly. Evaluate the brackets first: $9 - 4 = 5$, then $5 \\times 3 = 15$."},{"text":"$5$.","correct":false,"explanation":"This stops after evaluating the brackets and omits the remaining multiplication. After finding $9 - 4 = 5$, multiply by $3$ to obtain $15$."},{"text":"$3$.","correct":false,"explanation":"This can result from treating the bracket and multiplier as separate values rather than connected operations. First find $9 - 4 = 5$, then calculate $5 \\times 3 = 15$."}]},{"id":"04fdf322-973f-fc4b-8c83-0d28d8aa0b5a","cardType":"cloze","points":null,"front":"An index tells you how many times to multiply a number by [ ].","back":"An index tells you how many times to multiply a number by itself.","mcqOptions":[{"text":"itself","correct":true,"explanation":"An index represents repeated multiplication using the same base number. For example, $4^2$ contains two factors of $4$, so it means $4 \\times 4$."},{"text":"the index","correct":false,"explanation":"A common misconception is to multiply the base by its index, such as interpreting $4^2$ as $4 \\times 2$. The base is instead multiplied by itself."},{"text":"the answer","correct":false,"explanation":"The answer is produced only after the repeated multiplication has been completed. An index tells how many times the base number is used as a factor with itself."},{"text":"its double","correct":false,"explanation":"An index does not instruct you to double the base. It shows how many copies of the base are multiplied together, meaning the number is multiplied by itself."}]},{"id":"aa9ac552-9888-1320-9c09-cc41520f9caa","cardType":"basic","points":1,"front":"What does $4^2$ mean?","back":"$4 \\times 4$.","mcqOptions":[{"text":"$4 \\times 4$.","correct":true,"explanation":"The index $2$ means that the base $4$ appears as a factor twice. Therefore the power represents two copies of $4$ multiplied together."},{"text":"$4 \\times 2$.","correct":false,"explanation":"Multiplying the base by the index is a common powers misconception. The index counts how many factors of $4$ are used, so the meaning is $4 \\times 4$."},{"text":"$4 + 4$.","correct":false,"explanation":"An index represents repeated multiplication, not repeated addition. Since the index is $2$, two factors of $4$ are multiplied, giving $4 \\times 4$."},{"text":"$2 \\times 2$.","correct":false,"explanation":"This incorrectly uses the index as the number being multiplied. The base is $4$ and the index says to use it twice, so the meaning is $4 \\times 4$."}]},{"id":"7b926608-5b20-e0de-a80b-bb1d1f4551a4","cardType":"basic","points":1,"front":"Which part is worked out first in $7 + 4^2$?","back":"$4^2$.","mcqOptions":[{"text":"$4^2$.","correct":true,"explanation":"Indices come before addition in BIDMAS. The power must therefore be evaluated before its value is added to $7$."},{"text":"$7 + 4$.","correct":false,"explanation":"Working from left to right without considering the index ignores BIDMAS. The power $4^2$ has priority over addition and must be evaluated first."},{"text":"$4 \\times 2$.","correct":false,"explanation":"This misinterprets the index as multiplication by $2$. The power $4^2$ must be evaluated first and means $4 \\times 4$, not $4 \\times 2$."},{"text":"$7 + 2$.","correct":false,"explanation":"The index is not added to $7$ separately. BIDMAS requires the complete power $4^2$ to be evaluated before carrying out the addition."}]},{"id":"9ef90d79-fcc2-c86b-6008-46f2cc7ed7fa","cardType":"basic","points":2,"front":"Work out $7 + 4^2$.","back":"$23$.","mcqOptions":[{"text":"$23$.","correct":true,"explanation":"Evaluate the index before adding: $4^2 = 4 \\times 4 = 16$. The remaining calculation is $7 + 16$, which equals $23$."},{"text":"$22$.","correct":false,"explanation":"This usually comes from evaluating $4^2$ incorrectly as $15$. Squaring $4$ gives $4 \\times 4 = 16$, so $7 + 16 = 23$."},{"text":"$15$.","correct":false,"explanation":"This treats $4^2$ as $4 \\times 2 = 8$, a common index error. It actually means $4 \\times 4 = 16$, giving $7 + 16 = 23$."},{"text":"$121$.","correct":false,"explanation":"This comes from adding first and then squaring, so $(7 + 4)^2 = 121$. There are no brackets, so evaluate $4^2$ first and obtain $23$."}]},{"id":"80d904d9-6f20-4685-4898-f588623577f5","cardType":"cloze","points":null,"front":"If brackets are squared, work out [ ] first, then square the answer.","back":"If brackets are squared, work out inside the brackets first, then square the answer.","mcqOptions":[{"text":"inside the brackets","correct":true,"explanation":"Brackets have priority in BIDMAS, so the calculation inside them must be completed before applying the square to the resulting value."},{"text":"outside the brackets","correct":false,"explanation":"Working outside first reverses the required order. BIDMAS says to calculate inside the brackets first, then square the answer obtained."},{"text":"the square","correct":false,"explanation":"Squaring before evaluating the brackets treats the power as applying to only part of the expression. Calculate inside the brackets first, then square the result."},{"text":"the multiplication","correct":false,"explanation":"Multiplication does not take priority over brackets. Complete every operation inside the brackets first, following BIDMAS within them, and then square the answer."}]},{"id":"c2b6dd6b-7560-38e0-a480-7389bbbc61f6","cardType":"basic","points":2,"front":"Work out $(6 + 2)^2$.","back":"$64$.","mcqOptions":[{"text":"$64$.","correct":true,"explanation":"The brackets are evaluated first: $6+2=8$. The resulting value is then squared, giving $8^2=64$."},{"text":"$10$.","correct":false,"explanation":"Adding $2^2$ to $6$ squares only the second number, not the whole bracket. First find $6+2=8$, then calculate $8^2=64$."},{"text":"$40$.","correct":false,"explanation":"Squaring both numbers and then adding gives $6^2+2^2=40$, but the square applies to the entire bracket. Since $6+2=8$, the answer is $64$."},{"text":"$16$.","correct":false,"explanation":"Multiplying the bracket’s numbers gives $6\\times2=12$, not the required operation. Evaluate the addition first to get $8$, then square it to obtain $64$."}]},{"id":"d860b945-52e5-73bd-bb3f-77a4b9a5bde4","cardType":"basic","points":1,"front":"Which operation is done first in $5 + 18 \\div 3$?","back":"$18 \\div 3$.","mcqOptions":[{"text":"$18 \\div 3$.","correct":true,"explanation":"Division comes before addition in BIDMAS, so $18\\div3$ must be evaluated before adding the resulting value to $5$."},{"text":"$5 + 18$.","correct":false,"explanation":"Choosing the leftmost operation ignores the BIDMAS priority rules. Division has priority over addition, so $18\\div3$ is the operation completed first."},{"text":"$5 + 3$.","correct":false,"explanation":"The $3$ is the divisor and cannot be added to $5$ first. BIDMAS requires the division $18\\div3$ to be completed before the addition."},{"text":"$18 + 3$.","correct":false,"explanation":"The symbol between $18$ and $3$ is division, not addition. Therefore, the first operation is $18\\div3$, as division precedes addition in BIDMAS."}]},{"id":"5ac71a0b-6724-c225-d5f3-3418d0e1c2d6","cardType":"basic","points":2,"front":"Work out $5 + 18 \\div 3$.","back":"$11$.","mcqOptions":[{"text":"$11$.","correct":true,"explanation":"Division is completed before addition: $18\\div3=6$. Adding this result to $5$ gives $5+6=11$."},{"text":"$23$.","correct":false,"explanation":"This comes from adding $5+18$ before dividing, which ignores BIDMAS. Calculate $18\\div3=6$ first, then $5+6=11$."},{"text":"$7$.","correct":false,"explanation":"Dividing $18$ by $3$ gives $6$, not $2$. Division is done first, so the complete calculation is $5+6=11$."},{"text":"$13$.","correct":false,"explanation":"This results from an incorrect division or addition step. BIDMAS gives $18\\div3=6$ first, followed by $5+6=11$."}]},{"id":"29d7cce7-d4b0-afb4-872a-b9fc0956cd6f","cardType":"cloze","points":null,"front":"When multiplication and division both appear, work from [ ].","back":"When multiplication and division both appear, work from left to right.","mcqOptions":[{"text":"left to right","correct":true,"explanation":"Multiplication and division have equal priority in BIDMAS. When both occur, perform them in the order they appear, working from left to right."},{"text":"right to left","correct":false,"explanation":"Equal-priority operations are not evaluated from the right. Multiplication and division must be completed in the order they appear, working from left to right."},{"text":"multiplication to division","correct":false,"explanation":"The BIDMAS lettering does not mean multiplication always precedes division. They have equal priority, so the correct method is to work from left to right."},{"text":"division to multiplication","correct":false,"explanation":"Division does not automatically precede multiplication. Since the two operations have equal priority, they must be evaluated from left to right."}]},{"id":"889dc8dc-042b-e689-9cbb-3974c4a4cb24","cardType":"basic","points":3,"front":"Work out $4 + 8 \\times 3 \\div 6$.","back":"$8$.","mcqOptions":[{"text":"$8$.","correct":true,"explanation":"Multiplication and division are evaluated from left to right: $8\\times3=24$ and $24\\div6=4$. Finally, $4+4=8$."},{"text":"$6$.","correct":false,"explanation":"This comes from doing the addition first and then calculating from left to right. Multiplication and division take priority, giving $8\\times3\\div6=4$, then $4+4=8$."},{"text":"$20$.","correct":false,"explanation":"This can result from reversing the division and treating $3\\div6$ as $6\\div3$. Correctly working left to right gives $24\\div6=4$, so the answer is $8$."},{"text":"$28$.","correct":false,"explanation":"This stops after calculating $4+8\\times3$ and ignores the division by $6$. Completing both equal-priority operations first gives $24\\div6=4$, then $4+4=8$."}]},{"id":"c87e3b82-9d24-fa49-0452-b8118a1f6702","cardType":"basic","points":1,"front":"When addition and subtraction both appear, what direction do you work in?","back":"Left to right.","mcqOptions":[{"text":"Left to right.","correct":true,"explanation":"Addition and subtraction have equal priority, so they are completed in the order they appear in the expression, working from left to right."},{"text":"Right to left.","correct":false,"explanation":"Equal-priority operations are evaluated in their written order, not from the right. When addition and subtraction both appear, work from left to right."},{"text":"Addition before subtraction.","correct":false,"explanation":"The order of the letters in BIDMAS does not give addition priority over subtraction. Both have equal priority, so work from left to right."},{"text":"Subtraction before addition.","correct":false,"explanation":"Subtraction does not automatically take priority over addition. These operations have equal priority and must be completed from left to right."}]},{"id":"e83ee5a7-1d1c-3527-535c-859bfb67161d","cardType":"basic","points":2,"front":"Work out $10 - 6 + 3$.","back":"$7$.","mcqOptions":[{"text":"$7$.","correct":true,"explanation":"Addition and subtraction have equal priority, so work from left to right: $10-6=4$, followed by $4+3=7$."},{"text":"$1$.","correct":false,"explanation":"This comes from adding $6+3$ first and then subtracting $9$ from $10$. Addition and subtraction have equal priority, so left-to-right evaluation gives $7$."},{"text":"$13$.","correct":false,"explanation":"This treats the subtraction of $6$ as addition and then subtracts $3$. Keeping the operation signs and working left to right gives $10-6+3=7$."},{"text":"$19$.","correct":false,"explanation":"This adds all three numbers and ignores the subtraction sign. Working left to right gives $10-6=4$, then $4+3=7$."}]},{"id":"486e6512-d702-0f58-58c3-6e35d7523b1d","cardType":"basic","points":3,"front":"Work out $5 + 4 \\times 2^3$.","back":"$37$.","mcqOptions":[{"text":"$37$.","correct":true,"explanation":"BIDMAS places indices before multiplication and addition: $2^3 = 8$, then $4 \\times 8 = 32$, and finally $5 + 32 = 37$."},{"text":"$72$.","correct":false,"explanation":"This comes from adding $5 + 4$ before multiplying, which ignores BIDMAS. Calculate the power and multiplication first, giving $5 + 4 \\times 8 = 37$."},{"text":"$29$.","correct":false,"explanation":"This treats $2^3$ as $2 \\times 3$, but an index means repeated multiplication. Since $2^3 = 8$, the correct calculation gives $37$."},{"text":"$517$.","correct":false,"explanation":"This incorrectly applies the power to the product $4 \\times 2$. The exponent belongs only to $2$, so $5 + 4 \\times 8 = 37$."}]},{"id":"ea10268f-cec6-9d9d-8ada-e9fc61b67e77","cardType":"basic","points":2,"front":"Add brackets to make $5 \\times 4 + 2 = 30$ correct.","back":"$5 \\times (4 + 2) = 30$.","mcqOptions":[{"text":"$5 \\times (4 + 2) = 30$.","correct":true,"explanation":"The brackets make the addition happen first, so $4 + 2 = 6$. Multiplying the result by $5$ then gives $5 \\times 6 = 30$."},{"text":"$(5 \\times 4) + 2 = 30$.","correct":false,"explanation":"These brackets only group the multiplication already completed first under BIDMAS, producing $20 + 2 = 22$. The correct placement is $5 \\times (4 + 2) = 30$."},{"text":"$(5 \\times 4 + 2) = 30$.","correct":false,"explanation":"Brackets around the entire expression do not change its order of operations, so its value remains $22$. Bracketing $4 + 2$ instead makes the value $30$."},{"text":"$5 \\times (4) + 2 = 30$.","correct":false,"explanation":"Brackets around a single number have no effect, leaving $5 \\times 4 + 2 = 22$. The addition must be grouped as $5 \\times (4 + 2) = 30$."}]},{"id":"e6f61e71-dbdd-3f95-ed77-c6e2b87925e4","cardType":"basic","points":3,"front":"Add brackets to make $3 + 2 \\times 4 + 5 = 45$ correct.","back":"$(3 + 2) \\times (4 + 5) = 45$.","mcqOptions":[{"text":"$(3 + 2) \\times (4 + 5) = 45$.","correct":true,"explanation":"The brackets create two sums: $3 + 2 = 5$ and $4 + 5 = 9$. Multiplying these results gives $5 \\times 9 = 45$."},{"text":"$(3 + 2) \\times 4 + 5 = 45$.","correct":false,"explanation":"Only the first addition is grouped, so the left-hand side becomes $5 \\times 4 + 5 = 25$. Both additions must be bracketed to give $45$."},{"text":"$3 + 2 \\times (4 + 5) = 45$.","correct":false,"explanation":"Grouping only $4 + 5$ gives $3 + 2 \\times 9 = 21$, not $45$. Grouping $3 + 2$ as well produces $5 \\times 9 = 45$."},{"text":"$(3 + 2 \\times 4) + 5 = 45$.","correct":false,"explanation":"These brackets preserve the original BIDMAS order, giving $3 + 8 + 5 = 16$. Separate brackets around both additions are required to create $5 \\times 9 = 45$."}]}]}],"examCountdown":null,"heading":"BIDMAS","title":"BIDMAS Flashcards","topbar":{"backHref":"/gcse/maths/ccea/flashcards"},"topicSidebar":"$L37"}]}],"topicId":"62973944-4827-0ac5-7ca3-518f93649b61","walled":"$L38"}],"$L39","$L3a"]