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## JSS2: MATHEMATICS - 1ST TERM

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Lesson 7, Topic 3
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# Rounding Off Numbers

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#### Topic Content:

• Rounding Off Numbers

To round off numbers simply means making a number simpler but keeping its value close to what it was. Rounding numbers means adjusting the digits (up or down) to make rough calculations easier.

The result will be an estimated answer, not a precise one.

For example, if the population of a country is 8, 214, 426 in a certain year, this number is hard to remember but if we say the population of that country is 8 million, it is a good estimate, because it does not make any real difference what the exact number is. For example, 73 is rounded off to 70 because 73 is closer to 70 than 80.

Rules:

1. Round down digits  0, 1, 2,3,4,   (i.e. add 0)

2. Round up digits  5, 6, 7, 8, 9   (i.e. add 1)

To find the number of decimal places, simply count the number of figures after the decimal point.

Decimal places (d.p)

### Worked Example 7.3.1:

Write:

a. 17.6536
b. 25.2999

to

i. 1 d.p
ii. 2 d.p
iii. 3 d.p

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