Chapter 7 Decimals Worksheet - New Century Maths Page 13
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38Example 12
1 Subtract 8.914 from 46.029.
Solution
Estimate: 46 − 9 = 37.
The answer should be about 37.
46.029
− 8.914
37.115
2 Find the answer to 4.31 − 2.183.
Solution
Estimate: 4 − 2 = 2.
4.310
Hint: Fill the spaces with zeros.
− 2.183
2.127
To really understand decimals, we need to be able to count up and down by decimal fraction
Spreadsheet
steps. Use the link to go to an activity enabling you to practise this skill.
7-02
Counting with
Exercise 7-05
decimals
1 Copy and complete these addition calculations:
Example 11
a
5.3
b 4.723
c
43.5
d 12.755
6.2
0.01
116.29
1.35
+ 0.5
+ 12.2
7.3
18.675
+ 0.227
+ 49
e
0.0076
f
37
g
6.83
h
0.057
1.23
3.45
0.5
0.1324
+ 0.9
1.98
12.387
5.6731
+ 548.7
+ 5.001
+ 38.009
Example 12
2 Copy and complete these subtraction calculations:
a
8.936
b 57.703
c
6.1
d 23.57
− 3.513
− 16.21
− 0.2
− 16.88
e
22.6
f
30.001
g
6.03
h 48.6
− 13.54
− 1.73
− 4.091
− 9.951
3 Find the answers to these:
a 103.67 + 9.81 + 0.24 + 3.7
b 4.6 + 2.9 + 15 + 0.16 + 32.32
c 98.64 − 41.09
d 7.41 − 3.95
e 38.624 + 1.109 + 23.7 + 0.65
f 81.91 + 3.254 + 681.7 + 458
g 2.91 + 32.5 − 18.9
h 1.57 − 0.89 + 2.34
58.94 − 2.31 − 46.13
j 14.62 − 0.195 + 6.37
i
4 An electrician needed these lengths of cable to complete a wiring job: 12.3 m, 4.8 m,
18.7 m, 7.98 m, 13.65 m and 23.6 m.
a How many metres of cable did the electrician use?
b If the full spool of cable was 100 m long, how many metres of cable were left in the
spool after the electrician completed the job.
210
NEW CENTURY MATHS 7
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