HELP MATHS
APPROXIMATING AND CHECKING CALCULATIONS |
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Significant figures To round a number to a given number of significant places apply the same rule as with decimal places: EXAMPLES: Estimates and approximations -
Estimating is a good way of checking answers:
- Round the numbers to "easy" numbers, usually numbers with 1 or 2 significant figures.
- Work out the estimate using these easy numbers.
- For multiplying or dividing never approximate a number to zero (use 0.1, 0.01, 0.001,...)
Laura does the calculation Laura's answer is 1356.9 Estimate: Laura's answer is not the right order of magnitude. It is 10 times too big. |