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When rounding to the nearest 10, 100 etc or to a specific number of decimal places/significant figures, if the digit after the cut−off point is 5 or above, round up − if it’s under 5, round down.
Round 2.578 to two decimal places.
8 is the number after two decimal places and is above 5 so round up.
Round 0.005708 to three significant figures.
The first non zero number i.e. significant figure is 5. 8 is the number after three significant figures and is above 5 so round up.
Round 12,563 to two significant figures.
5 is the number after two significant figures and is 5 or above so round up.
Round 6.453 to two decimal places.
3 is the number after two decimal places and is below 5 so round down.
An classroom seats 32 pupils. On a given day only 13 pupils are present, calculate the part of seats that are filled as a percentage. Give your answer to the nearest whole number.
(13/32) × 100% = 40.625%
The answer to the nearest whole number is 41%.
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