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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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Presentation Transcript
rounding
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
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
1359.834
  • 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
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
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
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