Rounding
Rounding to significant figures
Rounding to significant figures has many uses for example if a journey is 6924 miles long then it would be much easier to round it up to the nearest thousand, 7000 miles.
To round to a significant figure you
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If rounding to the first significant figure you look at the first digit that is NOT 0.
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Look at the digit after the one you are rounding to. eg if rounding 6924 to 1 SF, look at the 9.
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If the digit is 5 or more then you round up. eg 583 to 1 SF would round to 600.
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If the digit is 4 or less then you round down. eg 543 would round to 500.
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fill in any spaces to the right of the rounded number with 0's.
Example
543,576 to 2 significant figures
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54|3576
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3 is 4 or less so we round down
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54 and fill in all spaces to the right with 0's
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So the answer is 540,000