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Estimating Exercises

Question 1

Give the following numbers as a value that represents a suitable estimate of it.

  1. 6780 ≈

  2. 35 ≈

  3. 53999 ≈

  4. 24 ≈

  5. 1500 ≈

Question 2

By giving suitable estimates for the values in the following calculations, estimate the answer.

question

 

 

MATH STUDIES

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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:image1  this can be rounded to image2 = 30 so the approximate answer to image3 is 30

 

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

Hence image1 ≈ 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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