Units of time

This list below shows the units we use to measure time. It also shows the conversion from one unit to another.

60 seconds = 1 minute

60 minutes = 1 hour

24 hours = 1 day

7 days = 1 week

365 days = 1 year ( 366 days in a leap year)

Question

a) How many minutes are there in 6 hours?

b) How many hours are there in a week?

c) How many weeks make up 63 days?

a) 60 \times 6 = 360 minutes

b) 24 \times 7 = 168 hours in one week

c) 63 \div 7 = 9 weeks (there are 7 days in a week)

You must be careful when using fractions and decimals with units of time. For example, 0.5 hours equals 30 minutes, not 50 minutes. This is because decimals show fractions of tenths, hundredths, thousandths and so on. But minutes are measured in sixtieths of an hour. Similarly, \frac{1}{4} hour equals 15 minutes and \frac{1}{10} hour equals 6 minutes.