Approximation and Estimation
(Rounding off)
Name:
(
)
Worksheet
1
Class:
Points to Note:
1)
If the next digit is
→
smaller than 5 →
5 or greater
round up
round down
Examples:
Round off 2679 to the nearest 10.
10s place
2679
≈ 2680 (correct to the nearest 10)
Is the next digit 5
or greater?
Page 75
By: Mr Wong Han Ming
Round off 2639.25 to the nearest integer (1s).
1s place
2639.25
≈ 2639 (correct to the nearest integer)
Is the next digit 5
or greater?
Practice:
1)
Round off 389.49 to the nearest 10.
2)
Round off 258.51 to the nearest integer.
3)
Round off 66 579 to the nearest 100.
4)
Round off 65 498 732 to the nearest million (1 000 000).
5)
Round off 619 875 to the nearest thousand.
6)
Round off 981 564 to the nearest ten thousand.
Answers:
1)
2)
3)
4)
5)
6)
390 (correct to the nearest 10)
259 (correct to the nearest integer)
66 600 (correct to the nearest 100)
65 000 000 (correct to the nearest million)
620 000 (correct to the nearest thousand)
980 000 (correct to the nearest ten thousand)
Page 76
By: Mr Wong Han Ming