Topic Content:
- Rounding Off Numbers
“Rounding off” means making a number simple but keeping its value close to what it was. The result may be less accurate, but easier to use.
There are many ways to round. This is the most common method:
1. Decide which is the last digit to keep.
2. Leave it the same if the next digit is less than 5 (this is called rounding down)
3. Increase it by 1 if the next digit is 5 or more (this is called rounding up).
Worked Example 11.2.1:
i. Round 2345 to the nearest 10
ii. Round 1734 to the nearest 100.
iii. Round to the nearest thousand
(a) 14 514
(b) 3 453 16
i. 2345 to nearest ten
Solution
5 unit is rounded up
The number in the tens increases by 1.
Hence 2 3 4 5 to nearest Ten is 2 3 5 0.
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