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 Note: Answers require pop-up windows to be enabled. Estimating Exercises Question 1 Give the following numbers as a value that represents a suitable estimate of it. 6780 ≈ 35 ≈ 53999 ≈ 24 ≈ 1500 ≈ Question 2 By giving suitable estimates for the values in the following calculations, estimate the answer.

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Number and Algebra

Estimating

Often when we are doing calculations we can estimate the answer by rounding up a number to the nearest tens, hundreds etc.

Example:  this can be rounded to = 30 so the approximate answer to is 30

When we give an answer that is approximate we use the symbol ≈ rather than =

Hence ≈ 30

To round up a number we see which whole number it is closest to in terms of tens, hundreds etc.

It will depend on the numbers in the question as to how you round up the number.

Example

932 could be rounded up to 930 or to 900, whereas 950 would be rounded to 1000 or left as 950

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