Page 97 - Math Smart - 7

CHAPTER 4.4

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In this chapter
Rounding Numbers Pupils should be able to:
• round whole numbers
to the nearest 10, 100
The attendance at the Singapore Grand Prix in 2018 was not exactly 260 400 or 1000 and decimals,
people. When working with numbers, we do not always need to be exact. including measurements,
Rounding is a way of simplifying numbers to make it easier to describe and to the nearest whole
number or one decimal
understand the numbers.
place
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Rounding numbers to the O Round each number

to the nearest
nearest whole number or
hundred,
1 decimal place a) 564 b)1205
e Round each number
We round numbers to give an approximate value that is close to the real value. to the nearest tenth,
Rounding of numbers can make calculations easier. a) 4.51 b) 30.99

You can round numbers to the nearest whole number, 10, 100, 1000 or other
multiples of 10.

The distance between Singapore and Beijing is 4484.048 km.
• If you round the distance to the nearest whole number, it is approximately
In the example on the
4484 km.
left, which estimated
• If you round the distance to the nearest 10, it is approximately 4480 km.
value here is closest to
• If you round the distance to the nearest 100, it is approximately 4500 km.
the actual value? Explain.
You can round numbers to a given number of decimal places.

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