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Rounding

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You can be asked to round to the nearest:

- the nearest whole number,
- the nearest ten/ hundred etc,
- a specified number of decimal places,
- a specified number of significant figures

To round: mark where you are rounding to.

357.956

If the next number down is 5 or more, your marked number goes up one. 357.956

357.96 to 2 dp.

357.956 to 1 decimal places

357.956

358.0 to 1 dp.

The 0 is important

- 1359.83 to 2 dp
- 1359.8 to 1dp
- 1360 to nearest whole number
- 1360 to nearest ten
- 1400 to nearest hundred
- 1000 to nearest thousand

- The furthest left non zero number is your first significant figure.
- e.g 596.32 0.003296 4002
- The next one right is the second sig fig and so on.

3rd sig fig

4002

2nd sig fig

1st sig fig

- 596.32 = 596
- 0.003296 = 0.00330
- 4002 = 4000
- So a number to 3 significant figures can have more than 3 digits if zeros are required to keep the value of the number