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

$$\frac{1}{10}$$ hour equals $$6$$ minutes.