cloze","front":"The first significant figure of a number is the first [ ] digit.","back":"The first significant figure of a number is the first non-zero digit.","points":null},{"id":"42b4bfd0-cb75-412e-bfa5-87e82d398133","cardType":"basic","front":"What is the result of rounding 0.196 to one significant figure?","back":"0.2","points":1},{"id":"f3799dc1-9b3c-4412-a334-d487844a9e9e","cardType":"basic","front":"What is the result of rounding 431.1 to one significant figure?","back":"400","points":1},{"id":"359621a6-ad9a-489a-b98e-c11f73de03ce","cardType":"cloze","front":"In a number like $0.049$, the zeros before the 4 are only [ ].","back":"In a number like $0.049$, the zeros before the 4 are only placeholders.","points":null},{"id":"7eb40153-4d56-46c5-8843-39ff7b2159a0","cardType":"basic","front":"When estimating a calculation involving multiple numbers, when should you round the values?","back":"Before performing any calculations.","points":1},{"id":"62e2293c-c285-4882-8879-155de0adfd68","cardType":"basic","front":"Estimate the value of $\\frac{49.3 \\times 58.7}{9.8}$.","back":"

Round to $\\frac{50 \\times 60}{10}$
$3000 \\div 10 = 300$

","points":2},{"id":"8b23f4e4-d8be-4bf0-96a2-7839e6a7b899","cardType":"basic","front":"How does dividing by 0.2 affect the size of a number?","back":"It makes the number larger (equivalent to multiplying by 5).","points":2},{"id":"68bad58f-2889-40bd-9636-ad1408ef557e","cardType":"basic","front":"Estimate the value of $\\frac{7.9 + 22.6}{0.204}$.","back":"

Round to $\\frac{8 + 20}{0.2}$
$28 \\div 0.2 = 140$

","points":2},{"id":"2153e72a-3187-4bc6-b7ce-e9fe9e3853ad","cardType":"basic","front":"How should you round a value under a square root (e.g. $\\sqrt{97.6}$) when estimating?","back":"Round it to the nearest square number (e.g. $\\sqrt{100} = 10$).","points":1},{"id":"922704cb-d12c-490a-a41e-e215451493af","cardType":"basic","front":"Why is an estimate useful when using a calculator?","back":"To check if the calculator answer is a sensible/reasonable size.","points":1},{"id":"f9d3a349-0016-4222-9883-7b83aad7363d","cardType":"basic","front":"An estimate uses $10 \\times 40$ to calculate $9.82 \\times 38$. Is this an overestimate or underestimate?","back":"Overestimate because both values were rounded up.","points":2},{"id":"f3565f2d-82db-4bcc-a5e7-2624ea7f49db","cardType":"basic","front":"If the cost of an item is 3.1 pence, what rounded value should be used to estimate the total cost in pounds?","back":"3 pence (later divided by 100 to convert to pounds).","points":1},{"id":"65cff510-1703-44a9-b2de-d270aa9b3d2b","cardType":"cloze","front":"In division, making the denominator [ ] makes the final estimate smaller.","back":"In division, making the denominator bigger makes the final estimate smaller.","points":null},{"id":"7393b485-2acb-4f6c-81ff-d0e41c8d78fe","cardType":"cloze","front":"In division, making the denominator bigger makes the final estimate [ ].","back":"In division, making the denominator bigger makes the final estimate smaller.","points":null},{"id":"b4d4046b-51c7-478d-b7c1-b1866288cfa7","cardType":"basic","front":"When estimating the area of a circle ($A = \\pi r^2$) without a calculator, what value is typically used for $\\pi$?","back":"3","points":1},{"id":"72c1e0e7-c6ae-4de0-9171-630332bb261b","cardType":"cloze","front":"Rounding the amount being subtracted [ ] results in an underestimate of the final

Estimating Flashcards

Estimating Flashcards

Estimating Flashcards

Estimating Flashcards