Rounding And Estimating Worksheet Page 6
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18MEP Y8 Practice Book A
4.3
4.
Write out each of the calculations below, filling in the missing numbers:
×
+
=
? × − =
(a)
3
?
2
17
(b)
5
8
22
(
)
+
×
=
−
×
=
(c)
4
?
2
20
(d)
6
?
2
0
(
)
−
×
=
? ÷ +
=
(e)
7
?
4
20
(f)
3
4
8
5.
Jane writes down:
×
+
× =
4
7
2
3
90
(a)
Explain why her answer is incorrect, and calculate the correct answer.
(b)
By using brackets Jane can make her calculation correct. Show how
this can be done.
6.
Esther and Andy are given this problem:
÷
− +
30
6
3 1
Esther says the answer is 1.
Andy says the answer is 11.
(a)
Is either of them correct?
(b)
Show how Esther could insert brackets to give her answer.
(c)
Show how Andy could insert brackets to give his answer.
7.
State whether each one of the statements below is true or false:
(
)
(
)
(
)
(
)
×
×
= ×
×
+
+
=
+
+
(a)
3
6
2
3
6
2
(b)
4
2
7
4
2
7
(
)
(
)
(
)
(
)
−
− = −
−
÷
÷
= ÷
÷
(c)
8
2
1 8
2
1
(d)
8
2
2
8
2
2
8.
Put brackets into each of the calculations below to make it correct:
−
− =
(a)
13
4
1 10
−
+
=
(b)
30
9
2
19
÷
÷ =
(c)
60
6
3
30
9.
Calculate:
÷
−
×
−
(a)
8 2
.
0 2
.
0 1
.
(b)
3 6
.
0 2
.
0 1
.
(
)
×
−
−
×
(c)
8 2
.
6
5 4
.
(d)
2 2
.
0 7
.
0 2
.
10.
Write out each of the calculations below, filling in the missing numbers:
+
×
=
×
+
×
=
(a)
0 8
.
?
0 6
.
3 2
.
(b)
?
0 5
.
6
0 4
.
3 9
.
+
÷
=
÷
−
=
(c)
0 9
.
4 8
.
?
6 9
.
(d)
2 7
.
?
1 4
.
1 6
.
68
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