Rounding And Estimating Worksheet
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18MEP Y8 Practice Book A
4 Rounding and Estimating
4.1 Revision of the Four Rules: Whole Numbers
Example 1
Calculate:
+
−
(a)
464
97
(b)
184
36
×
÷
(c)
47 12
(d)
710
5
Solution
7
1
(a)
4 6 4
(b)
1 8 4
+
9 7
–
3 6
5 6 1
1 4 8
1 1
1 4 2
1
2
(c)
4 7
(d)
5 7 1 0
×
1 2
9 4
4 7 0
5 6 4
1
Exercises
Work out the answer to each question without using a calculator. Check your
answers with a calculator.
+
+
+
1.
(a)
13 16
(b)
24
22
(c)
45
34
+
+
+
(d)
(e)
(f)
123
51
214
135
201 356
+
+
+
2.
(a)
36 102
(b)
88
35
(c)
66
282
+
+
+
(d)
97 142
(e)
361
421
(f)
188
924
−
−
−
3.
(a)
25 13
(b)
66
22
(c)
97
46
−
−
−
(d)
136 121
(e)
258
39
(f)
971
420
63
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