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What you need to know
What you need to know:
When faced with a complicated calculation, you may be asked to simplify it, in turn allowing you to get an approximate answer quickly, and without using a calculator. Most commonly (but not always) this involves rounding each of the numbers in the calculation to 1 or 2 significant figures.
For example we can estimate (14.9 \times 11.2) \div 53.5 by calculating (15 \times 10) \div 50 = 150 \div 50 = 3, therefore we can say that the answer to the original calculation will be approximately 3 (indeed, the actual answer is 3.12, to 2 decimal places).
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