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## JSS1: MATHEMATICS - 1ST TERM

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Lesson 12, Topic 6
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# Approximation Involving the Four Basic Operations

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#### Topic Content:

• Approximation Involving the Four Basic Operations

### Worked Example 12.6.1:

What is the approximated answer to each of the following addition problems?

i. 708   +   194
ii. 57.6   +   83.9

Solution

Round each number to 1 s.f or to the nearest 100. We have

i. 708   +  194     ≈     700   +   200    =    900

ii. 57.6   +   83.9   ≈      60   +   80   =    140

### Worked Example 12.6.2:

Round off each number to 1 s.f.

i. 3072 – 1365
ii. 595.845 –  96.869

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