Calculating with years
You learn to work out how many years there are between two years.
How to work it out
- The number of years between two years is the later year minus the earlier one.
- Work it out by jumping to a round year first.
- Then add the jumps together.
How many years are there between 1648 and 1815?
- First jump to a round year: from 1648 to 1700 is 52 years.
- Then from 1700 to 1815 is 115 years.
- Together 52 + 115 = 167 years.
More examples
A windmill was built in 1880. How old was it in 2000?
2000 − 1880 = 120 years.
How many years are there between 1945 and 1990?
45 years.