GCSE Maths (Edexcel)
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Number
Measures and Accuracy
Rounding to Significant Figures
3:51
Rounding
Spec
N15
- Rounding a number to a certain number of significant figures is useful in the sciences
- Significant figures are digits that contribute to the precision of a number
- Insignificant zeroes are ignored, significant zeroes are counted
- If the digit to the right is 5 or greater, round up; if it is less than 5, round down
- Example: rounding 5,607,012 to 3 significant figures
- Example: rounding 0.012345 to 2 significant figures
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