AQA · Mathematics · 8300
GCSE Maths: Time: calculations
Geometry & Measures · AQA GCSE Maths (8300). Cards are generated from the Corbettmaths practice questions for Time: calculations (Corbettmaths Video 322), and every card links back to the exact page it came from. Practice tests are drawn from this deck’s own cards. Source material © Corbettmaths — used with attribution.
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How many minutes are in 1 hour?
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60 minutes.
How many seconds are in 1 minute?
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60 seconds.
How many minutes are in 1.5 hours?
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90 minutes. (1 hour = 60 minutes, so half an hour = 30 minutes, giving 60 + 30 = 90.)
How do you calculate the duration between two times?
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Subtract the start time from the end time. For times crossing the hour, count up from the start to the next hour, then add remaining minutes.
How many hours are in 1 day?
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24 hours.
What does 'express' mean in the context of a bus or train service?
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An express service makes fewer stops and completes the journey faster than a regular service.
When calculating a journey end time, how do you add minutes to a start time?
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Add the minutes to the start time. If the total minutes exceed 60, add 1 hour and subtract 60 from the minutes.
How do you convert decimal hours (like 5.4 hours) to hours and minutes?
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Keep the whole number as hours. Multiply the decimal part by 60 to get minutes. (Example: 5.4 hours = 5 hours + 0.4 × 60 = 5 hours 24 minutes.)
How many days are in a typical week?
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7 days.
What does GMT stand for in time zones?
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Greenwich Mean Time.
When calculating total cost from a per-minute rate, what calculation do you perform?
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Multiply the rate per minute by the total number of minutes. Example: £0.05 per minute × 112 minutes = £5.60.
When calculating hourly costs for lessons of different durations, what must you do first?
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Convert all lesson durations to hours (or the same unit), then multiply by the hourly rate and sum the costs.
If someone works from 10am to 3:30pm, how many hours have they worked?
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5.5 hours (or 5 hours and 30 minutes).
What does "1½ times the normal rate" mean for an hourly wage?
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Multiply the normal hourly rate by 1.5. For example, £16 per hour becomes £24 per hour.
If someone earns £16 per hour and works for 5.5 hours, how much do they earn?
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£88. Calculate: 16 × 5.5 = 88.
When calculating time zone differences, if it is 1pm in London and 8pm in Beijing, what is the time difference?
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7 hours. Beijing is 7 hours ahead of London.
Why must you account for time zone differences when calculating flight duration?
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The departure and arrival times shown on tickets are in local times, so you need to adjust for the time zone difference to find the actual travel time.
How do you calculate total earnings when working multiple days at different rates?
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Calculate earnings for each day separately (hours × rate), then add them all together.
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