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The rule is - whatever number of decimal places you're rounding off to - look at the NEXT number...

For example - round 23.456 to two decimal places. The number in the THIRD decimal place is 5 or more so you round UP to get 23.46.

IF the number had been 23.454, you would round DOWN to yield 23.45.

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Q: How are decimal numbers rounded off to any given signiFIcant figures?
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