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24:[["$","$L33",null,{"feature":"flashcards"}],"$L34",["$","$L35",null,{"href":"/gcse/maths/ocr/grade-1-1-3-time/flashcards","label":"Time","subjectCode":"gcse_maths__ocr","surface":"flashcards"}],["$","$L36",null,{"runner":["$","div",null,{"className":"min-h-0 flex-1 overflow-hidden bg-background","children":["$","$L37",null,{"decks":[{"id":"b14ac160-151d-b77c-9f10-eb31f6d2e908","title":"Time Flashcards","topicId":"c3d2b288-8adc-4e41-84c0-95251d829c9e","topicSlug":"grade-1-1-3-time","cards":[{"id":"e469fa89-15af-d797-9e6d-87c7064bb696","cardType":"basic","points":1,"front":"How many minutes are in 1 hour?","back":"60 minutes.","mcqOptions":[{"text":"60 minutes.","correct":true,"explanation":"An hour is divided into 60 equal minutes, so 1 hour contains exactly 60 minutes."},{"text":"100 minutes.","correct":false,"explanation":"This treats time as a base-10 measurement. Time uses 60 minutes per hour, so 1 hour is 60 minutes."},{"text":"30 minutes.","correct":false,"explanation":"Thirty minutes is half an hour, not a whole hour. A complete hour contains 60 minutes."},{"text":"24 minutes.","correct":false,"explanation":"This confuses the 24 hours in a day with the number of minutes in an hour. There are 60 minutes in 1 hour."}]},{"id":"8f0645e6-0878-c984-bfff-87bb4f213473","cardType":"cloze","points":null,"front":"To convert hours to minutes, [ ]; to convert minutes to hours, [ ].","back":"To convert hours to minutes, multiply by 60; to convert minutes to hours, divide by 60.","mcqOptions":[{"text":"To convert hours to minutes, multiply by 60; to convert minutes to hours, divide by 60.","correct":true,"explanation":"Each hour contains 60 minutes, so multiplying converts hours into minutes. Dividing by 60 reverses the conversion and gives the number of hours."},{"text":"To convert hours to minutes, divide by 60; to convert minutes to hours, multiply by 60.","correct":false,"explanation":"The operations have been reversed. Hours must be multiplied by 60 to find minutes, while minutes must be divided by 60 to find hours."},{"text":"To convert hours to minutes, multiply by 100; to convert minutes to hours, divide by 100.","correct":false,"explanation":"This incorrectly treats time as a decimal measurement. There are 60 minutes in an hour, so the conversion factor must be 60, not 100."},{"text":"To convert hours to minutes, multiply by 24; to convert minutes to hours, divide by 24.","correct":false,"explanation":"Twenty-four is the number of hours in a day, not minutes in an hour. Hour-minute conversions use multiplication or division by 60."}]},{"id":"10a897b4-5be6-7e6d-cb7d-54b9bf22d6ba","cardType":"basic","points":1,"front":"Change 240 minutes to hours.","back":"4 hours.","mcqOptions":[{"text":"4 hours.","correct":true,"explanation":"Converting minutes to hours requires division by 60. Since $240 \\div 60 = 4$, 240 minutes equals 4 hours."},{"text":"6 hours.","correct":false,"explanation":"This does not divide the minutes into groups of 60 correctly. Since $240 \\div 60 = 4$, the time is 4 hours."},{"text":"3 hours.","correct":false,"explanation":"Three hours contains only $3 \\times 60 = 180$ minutes. Dividing 240 minutes by 60 gives the correct total of 4 hours."},{"text":"2 hours.","correct":false,"explanation":"Two hours contains only $2 \\times 60 = 120$ minutes, which is half the given time. The correct calculation is $240 \\div 60 = 4$ hours."}]},{"id":"c4b8a090-27ee-8774-a3ca-ad85db3adda4","cardType":"basic","points":1,"front":"Change 5 hours to minutes.","back":"300 minutes.","mcqOptions":[{"text":"300 minutes.","correct":true,"explanation":"Converting hours to minutes requires multiplication by 60. Therefore, $5 \\times 60 = 300$, so 5 hours equals 300 minutes."},{"text":"30 minutes.","correct":false,"explanation":"This divides by 10 instead of multiplying by 60. Each of the 5 hours contains 60 minutes, giving $5 \\times 60 = 300$ minutes."},{"text":"600 minutes.","correct":false,"explanation":"This doubles the correct conversion, as though each hour contained 120 minutes. Using 60 minutes per hour gives $5 \\times 60 = 300$ minutes."},{"text":"250 minutes.","correct":false,"explanation":"This uses 50 minutes per hour instead of 60. The correct conversion is $5 \\times 60 = 300$ minutes."}]},{"id":"2338d92a-1839-eb67-5bd5-d66fc6044928","cardType":"basic","points":1,"front":"How many minutes is half an hour?","back":"30 minutes.","mcqOptions":[{"text":"30 minutes.","correct":true,"explanation":"Half an hour means half of 60 minutes. Calculating $60 \\div 2$ gives 30 minutes."},{"text":"15 minutes.","correct":false,"explanation":"Fifteen minutes is a quarter of an hour, not half. Half of the 60 minutes in an hour is $60 \\div 2 = 30$ minutes."},{"text":"50 minutes.","correct":false,"explanation":"This treats half an hour as 0.5 of 100 minutes. Time is based on 60 minutes per hour, so half is 30 minutes."},{"text":"20 minutes.","correct":false,"explanation":"Twenty minutes is one third of an hour, not one half. Dividing 60 minutes by 2 gives the correct answer of 30 minutes."}]},{"id":"a988c951-81f7-d629-c526-3735ef609e73","cardType":"basic","points":1,"front":"How many minutes is a quarter of an hour?","back":"15 minutes.","mcqOptions":[{"text":"15 minutes.","correct":true,"explanation":"A quarter of an hour is one of four equal parts of 60 minutes. Therefore, $60 \\div 4 = 15$ minutes."},{"text":"20 minutes.","correct":false,"explanation":"Twenty minutes is one third of an hour. A quarter requires dividing the 60 minutes in an hour by 4, which gives 15 minutes."},{"text":"30 minutes.","correct":false,"explanation":"Thirty minutes is half an hour, not a quarter. Dividing 60 minutes into four equal parts gives 15 minutes per quarter."},{"text":"25 minutes.","correct":false,"explanation":"This incorrectly treats an hour as 100 minutes and finds one quarter of 100. An hour has 60 minutes, and $60 \\div 4 = 15$."}]},{"id":"ef2dea85-ea89-7b6e-9d1d-04a354588a08","cardType":"basic","points":1,"front":"How many minutes is three quarters of an hour?","back":"45 minutes.","mcqOptions":[{"text":"45 minutes.","correct":true,"explanation":"One quarter of 60 minutes is 15 minutes. Multiplying by 3 gives $15 \\times 3 = 45$ minutes for three quarters of an hour."},{"text":"75 minutes.","correct":false,"explanation":"This treats three quarters as 0.75 of 100 minutes. An hour has 60 minutes, so $\\frac{3}{4} \\times 60 = 45$ minutes."},{"text":"40 minutes.","correct":false,"explanation":"Forty minutes is two thirds of an hour, not three quarters. Three quarters of 60 is found by calculating $60 \\div 4 \\times 3 = 45$."},{"text":"50 minutes.","correct":false,"explanation":"This incorrectly divides an hour into decimal-style portions. Three quarters means three lots of 15 minutes, giving a total of 45 minutes."}]},{"id":"73defbe3-bf32-5a78-da56-a29f2f01ac9c","cardType":"basic","points":2,"front":"Change $1\\frac{1}{4}$ hours to minutes.","back":"75 minutes.","mcqOptions":[{"text":"75 minutes.","correct":true,"explanation":"One hour is 60 minutes and one quarter of an hour is 15 minutes. Adding them gives $60 + 15 = 75$ minutes."},{"text":"90 minutes.","correct":false,"explanation":"Ninety minutes equals one and a half hours, so the fractional part has been treated as a half. A quarter-hour is 15 minutes, giving 75 minutes."},{"text":"125 minutes.","correct":false,"explanation":"This reads $1\\frac{1}{4}$ hours as 1.25 of 100 minutes. Time uses 60 minutes per hour, so $1.25 \\times 60 = 75$ minutes."},{"text":"70 minutes.","correct":false,"explanation":"This treats a quarter of an hour as 10 minutes. Since $60 \\div 4 = 15$, the total is $60 + 15 = 75$ minutes."}]},{"id":"d8571067-33d4-76d0-4880-849f19356ef8","cardType":"cloze","points":null,"front":"Before comparing time durations, put both durations in the [ ].","back":"Before comparing time durations, put both durations in the same unit.","mcqOptions":[{"text":"same unit","correct":true,"explanation":"Using the same unit makes the numerical values directly comparable. For example, converting both durations to minutes allows an accurate comparison."},{"text":"different units","correct":false,"explanation":"Comparing values in different units can give a misleading result. Both durations must first be expressed in the same unit, such as minutes, before their sizes are compared."},{"text":"nearest hour","correct":false,"explanation":"Rounding each duration to the nearest hour loses information and may change which is longer. Convert both durations to the same unit without rounding."},{"text":"original form","correct":false,"explanation":"Leaving durations in their original forms may mean comparing hours with minutes. They should be converted into the same unit so the comparison is valid."}]},{"id":"4831ab3a-292a-a1b1-3705-54421dfb2e1e","cardType":"basic","points":2,"front":"Find the difference between 40 minutes and $1\\frac{1}{4}$ hours.","back":"35 minutes.","mcqOptions":[{"text":"35 minutes.","correct":true,"explanation":"One hour and a quarter equals $60+15=75$ minutes. The difference between 75 minutes and 40 minutes is therefore $75-40=35$ minutes."},{"text":"45 minutes.","correct":false,"explanation":"This comes from treating a quarter of an hour as 25 minutes. A quarter-hour is 15 minutes, so $1\\frac{1}{4}$ hours is 75 minutes and the difference is 35 minutes."},{"text":"25 minutes.","correct":false,"explanation":"This results from converting $1\\frac{1}{4}$ hours incorrectly. It equals 75 minutes, and subtracting 40 minutes gives a difference of 35 minutes."},{"text":"20 minutes.","correct":false,"explanation":"This compares 40 minutes with only the one-hour part and ignores the extra quarter-hour. Converting the full duration gives 75 minutes, so the difference is 35 minutes."}]},{"id":"b217246b-93b9-94de-28aa-ecf0a25da7a8","cardType":"cloze","points":null,"front":"When adding minutes to a clock time, it helps to reach the next [ ] time first.","back":"When adding minutes to a clock time, it helps to reach the next o’clock time first.","mcqOptions":[{"text":"o’clock","correct":true,"explanation":"Reaching the next o’clock time separates the calculation into a short step to the hour and a simpler step using the remaining minutes."},{"text":"half-past","correct":false,"explanation":"A half-past time is not always the next useful boundary and may already have passed. Reaching the next o’clock time first makes the remaining minutes easier to add."},{"text":"quarter-past","correct":false,"explanation":"Quarter-past is not the standard hour boundary used to simplify addition. Count to the next o’clock time, then add the minutes that remain."},{"text":"midnight","correct":false,"explanation":"Midnight is only one particular time and may be many hours away. The useful method is to count to the next o’clock time before adding the remainder."}]},{"id":"6e9bdfaf-4ce9-f0e0-ac00-fdd375f161bc","cardType":"basic","points":2,"front":"Nina leaves at 9:50 am and her journey lasts 39 minutes. What time does she arrive?","back":"10:29 am.","mcqOptions":[{"text":"10:29 am.","correct":true,"explanation":"From 9:50 am, the first 10 minutes reaches 10:00 am. Adding the remaining 29 minutes gives an arrival time of 10:29 am."},{"text":"10:19 am.","correct":false,"explanation":"This adds only 29 minutes rather than the full 39 minutes. Ten minutes reaches 10:00 am, and the remaining 29 minutes gives 10:29 am."},{"text":"11:29 am.","correct":false,"explanation":"This carries forward an extra hour. From 9:50 am, 10 minutes reaches 10:00 am and the remaining 29 minutes gives 10:29 am."},{"text":"10:39 am.","correct":false,"explanation":"This effectively adds 49 minutes because it fails to account for the 10 minutes used to reach 10:00 am. Only 29 minutes then remain, giving 10:29 am."}]},{"id":"a113b3d1-da57-94a9-0c74-ed1050f58327","cardType":"basic","points":1,"front":"How should 85 minutes be split when adding it to a clock time?","back":"60 minutes + 25 minutes.","mcqOptions":[{"text":"60 minutes + 25 minutes.","correct":true,"explanation":"Sixty minutes is one complete hour, leaving $85-60=25$ minutes. This split makes adding the duration to a clock time straightforward."},{"text":"60 minutes + 15 minutes.","correct":false,"explanation":"This split totals only 75 minutes, so 10 minutes would be missed. Since 85 minutes is one hour and 25 minutes, the correct split is 60 minutes + 25 minutes."},{"text":"60 minutes + 35 minutes.","correct":false,"explanation":"This split totals 95 minutes, adding 10 minutes too many. Subtracting one 60-minute hour from 85 minutes leaves 25 minutes, not 35 minutes."},{"text":"50 minutes + 25 minutes.","correct":false,"explanation":"This split totals only 75 minutes and does not separate out a complete hour. The useful correct split is 60 minutes + 25 minutes."}]},{"id":"9727394c-23a7-9afe-0c18-a2a069363d92","cardType":"basic","points":2,"front":"A film starts at 6:50 pm and lasts 85 minutes. What time does it finish?","back":"8:15 pm.","mcqOptions":[{"text":"8:15 pm.","correct":true,"explanation":"Eighty-five minutes is one hour and 25 minutes. Adding one hour to 6:50 pm gives 7:50 pm, then adding 25 minutes gives 8:15 pm."},{"text":"8:05 pm.","correct":false,"explanation":"This is the result of adding only 75 minutes, so the finish time is 10 minutes too early. Adding the full 85 minutes to 6:50 pm gives 8:15 pm."},{"text":"7:15 pm.","correct":false,"explanation":"This adds only the 25 minutes left after separating 85 minutes into one hour and 25 minutes. Including the full extra hour gives 8:15 pm."},{"text":"8:25 pm.","correct":false,"explanation":"This adds 95 minutes rather than 85 minutes, making the result 10 minutes too late. One hour and 25 minutes after 6:50 pm is 8:15 pm."}]},{"id":"6bfbfcf6-dffa-07db-de66-11813ad9201c","cardType":"cloze","points":null,"front":"Clock minutes go up to [ ], then the next [ ] begins.","back":"Clock minutes go up to 59, then the next hour begins.","mcqOptions":[{"text":"Clock minutes go up to 59, then the next hour begins.","correct":true,"explanation":"Clock minutes run from 00 to 59. One minute after a display ending in :59, the minutes return to 00 and the next hour begins."},{"text":"Clock minutes go up to 60, then the next hour begins.","correct":false,"explanation":"A clock does not display 60 as its minute value. After 59 minutes, the minute count returns to 00 and the next hour begins."},{"text":"Clock minutes go up to 59, then the next minute begins.","correct":false,"explanation":"The count does reach 59, but the boundary after it starts a new hour, not merely another minute within the same hour."},{"text":"Clock minutes go up to 60, then the next minute begins.","correct":false,"explanation":"This confuses elapsed minutes with the numbers displayed on a clock. Displayed minutes stop at 59, after which the next hour begins at 00 minutes."}]},{"id":"d1ba0151-7844-7c09-6793-de1e91eb19c1","cardType":"cloze","points":null,"front":"In the 24-hour clock, 0745 means [ ] and 1540 means [ ].","back":"In the 24-hour clock, 0745 means 7:45 am and 1540 means 3:40 pm.","mcqOptions":[{"text":"In the 24-hour clock, 0745 means 7:45 am and 1540 means 3:40 pm.","correct":true,"explanation":"Times before 1200 are am, so 0745 is 7:45 am. For 1540, subtracting 12 from the hour gives 3:40 pm."},{"text":"In the 24-hour clock, 0745 means 7:45 pm and 1540 means 3:40 pm.","correct":false,"explanation":"A time beginning with 07 is before midday, so 0745 is 7:45 am, not pm. Subtracting 12 from 15 correctly converts 1540 to 3:40 pm."},{"text":"In the 24-hour clock, 0745 means 7:45 am and 1540 means 5:40 pm.","correct":false,"explanation":"This converts the afternoon hour incorrectly. For a 24-hour time after 1259, subtract 12 from the hour: $15-12=3$, so 1540 is 3:40 pm."},{"text":"In the 24-hour clock, 0745 means 7:45 am and 1540 means 15:40 pm.","correct":false,"explanation":"This mixes 24-hour notation with the am/pm system. When pm is included, 15 must be converted by subtracting 12, making 1540 equal to 3:40 pm."}]},{"id":"3a012942-0873-b59e-f0f7-898fddd42d2f","cardType":"basic","points":2,"front":"Why should you read down the same column in a timetable?","back":"One column is the same bus or train.","mcqOptions":[{"text":"One column is the same bus or train.","correct":true,"explanation":"Each column follows one particular service through its route, so reading down that column gives the times for the same vehicle at successive stops."},{"text":"One column is the same station or stop.","correct":false,"explanation":"Rows usually represent places or stops, not individual services. The correct rule is that one column represents the same bus or train throughout its journey."},{"text":"One column is the same time at each stop.","correct":false,"explanation":"Times in a column normally change as the service travels. One column represents the same bus or train, allowing its route and times to be followed."},{"text":"One column is the next bus or train.","correct":false,"explanation":"Different columns usually show different services rather than different stages of one journey. Reading down one column follows the same bus or train."}]},{"id":"13c9ec85-16ae-046a-b7c1-42816e83eb44","cardType":"basic","points":1,"front":"If a timetable has a dash for a place, can you use that bus or train for that place?","back":"No - it does not stop there.","mcqOptions":[{"text":"No - it does not stop there.","correct":true,"explanation":"A dash means that the service does not call at that place, so it cannot be used to arrive at or depart from that stop."},{"text":"Yes - its time is not shown.","correct":false,"explanation":"A dash is not a missing arrival time; it indicates that the service does not stop there. Therefore, that bus or train cannot be used for that place."},{"text":"Yes - it stops on request.","correct":false,"explanation":"Request stops are normally identified separately, not by a dash. A dash means the bus or train does not stop at that place at all."},{"text":"Yes - it stops without a time.","correct":false,"explanation":"A dash does not mean the service stops without a scheduled time. It means the service does not stop there, so another service is needed."}]},{"id":"f39bbc8e-8b93-0dd6-7486-c5181735936e","cardType":"basic","points":2,"front":"A bus leaves Green Road at 0735 and reaches Station at 0805. How long is the journey?","back":"30 minutes.","mcqOptions":[{"text":"30 minutes.","correct":true,"explanation":"From 07:35 to 08:00 is 25 minutes, followed by another 5 minutes to 08:05, giving a total journey time of 30 minutes."},{"text":"70 minutes.","correct":false,"explanation":"Subtracting the minute figures as though both times were within the same hour gives 70 minutes incorrectly. Counting across 08:00 gives the correct duration of 30 minutes."},{"text":"25 minutes.","correct":false,"explanation":"This counts only from 07:35 to 08:00 and omits the final 5 minutes. Including the journey to 08:05 gives 30 minutes."},{"text":"40 minutes.","correct":false,"explanation":"Adding the displayed minute parts, 35 and 5, ignores the change of hour. Counting elapsed time properly from 07:35 to 08:05 gives 30 minutes."}]},{"id":"968290aa-8584-a640-84d5-f848cadb7f51","cardType":"cloze","points":null,"front":"For latest-time questions, work [ ] from the deadline.","back":"For latest-time questions, work backwards from the deadline.","mcqOptions":[{"text":"backwards","correct":true,"explanation":"A latest-time problem starts with the required arrival deadline and subtracts each journey stage, so the calculation must proceed backwards through the schedule."},{"text":"forwards","correct":false,"explanation":"Working forwards is useful when the departure time is known, but a latest-time question starts from the deadline and requires working backwards by subtracting durations."},{"text":"sideways","correct":false,"explanation":"Timetable calculations follow chronological steps rather than moving between unrelated columns. For a latest-time question, start at the deadline and work backwards."},{"text":"onwards","correct":false,"explanation":"Continuing onwards would calculate a later time after the deadline. To find the latest possible starting time, subtract each stage by working backwards."}]},{"id":"8481757a-1481-9371-fb1d-a9a829d7aedb","cardType":"basic","points":1,"front":"Sam must be at work by 09:00 and has an 8-minute walk from Town Centre. Latest bus arrival at Town Centre?","back":"08:52.","mcqOptions":[{"text":"08:52.","correct":true,"explanation":"Sam needs 8 minutes to walk after arriving, so subtracting 8 minutes from 09:00 gives the latest acceptable bus arrival time of 08:52."},{"text":"09:08.","correct":false,"explanation":"Adding the 8-minute walk to the deadline finds a time after Sam must already be at work. Subtracting 8 minutes from 09:00 gives 08:52."},{"text":"08:58.","correct":false,"explanation":"This subtracts only 2 minutes, likely confusing 8 minutes with the difference to the next hour. The full 8-minute walk requires arrival at 08:52."},{"text":"08:08.","correct":false,"explanation":"Subtracting 8 directly from the hour digits gives an invalid approach to time. Borrowing 60 minutes from 09:00 and subtracting 8 gives 08:52."}]},{"id":"6fe054ae-84ff-cb3a-53c2-bdb544de786d","cardType":"basic","points":1,"front":"Sam’s latest usable bus leaves Hill Road at 08:16, and the walk there takes 12 minutes. Latest leave-home time?","back":"08:04.","mcqOptions":[{"text":"08:04.","correct":true,"explanation":"Sam must allow 12 minutes before the 08:16 departure. Subtracting 12 minutes from 08:16 gives the latest leave-home time of 08:04."},{"text":"08:28.","correct":false,"explanation":"Adding the walking time gives a time after the bus has departed. Sam must subtract 12 minutes from 08:16, producing a latest departure from home of 08:04."},{"text":"08:14.","correct":false,"explanation":"Subtracting only the 2 in 12 leaves insufficient walking time. The complete 12-minute walk must be subtracted from 08:16, giving 08:04."},{"text":"08:00.","correct":false,"explanation":"This subtracts 16 minutes rather than the stated 12-minute walk. Subtracting the correct duration from the 08:16 bus departure gives 08:04."}]}]}],"examCountdown":{"examDate":"2027-05-14","paperLabel":"Paper 1"},"heading":"Time","title":"Time Flashcards","topbar":{"backHref":"/gcse/maths/ocr/flashcards"},"topicSidebar":"$L38"}]}],"topicId":"c3d2b288-8adc-4e41-84c0-95251d829c9e","walled":"$L39"}],"$L3a","$L3b"]