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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 

  • If rounding to the first significant figure you look at the first digit that is NOT 0.

  • Look at the digit after the one you are rounding to. eg if rounding 6924 to 1 SF, look at the 9.

  • If the digit is 5 or more then you round up. eg 583 to 1 SF would round to 600.

  • If the digit is 4 or less then you round down. eg 543 would round to 500.

  • fill in any spaces to the right of the rounded number with 0's.

Example

543,576 to 2 significant figures

  1. 54|3576

  2. 3 is 4 or less so we round down

  3. 54 and fill in all spaces to the right with 0's 

  4. So the answer is 540,000