Rounding - PowerPoint PPT Presentation

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Rounding. 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. 357.956 to 2 decimal places. To round: mark where you are rounding to. 357.9 5 6

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Rounding

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Rounding

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

357.956 to 2 decimal places

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

1359.834

• 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

Significant figures

• 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

To 3 Significant figures

• 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