lesson
Time units are not tenths
1 · Learn
One hour is 60 minutes and one minute is 60 seconds. Do not multiply by 100 when converting these units.
Two hours and fifteen minutes is 120 + 15 = 135 minutes. In 24-hour time, 7:20 pm is 19:20. On an analogue clock, the hour hand is partway between 7 and 8 at that time.
One year contains twelve months, including a leap year. Three years contain 3 times 12 = 36 months. For two weeks, use seven days in each week: 2 times 7 = 14 days. Choose the conversion fact that matches the units.
2 · Worked example
A film from 16:45 to 18:10 lasts 15 + 60 + 10 = 85 minutes, or one hour twenty-five minutes.
3 · Your turn
Convert three minutes to seconds and two weeks to days. How long is 09:35 to 10:20?
Check your answer
180 seconds; 14 days; 45 minutes.
4 · Apply your learning
Show digital times on a paper analogue clock. Use a calendar to connect 12 months to one year and practise related conversions.
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