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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. To round: mark where you are rounding to. 357.9 5 6

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Rounding

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  1. 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

  2. 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

  3. 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

  4. 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

  5. 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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