Chapter 7 Decimals Worksheet - New Century Maths Page 20
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38Using the multiplication rule
Animation
Example 14
7-01
1 Evaluate 3.05 × 4.8.
Multiplying
decimals
Solution
Step 1: Do the multiplication without decimal points.
Worksheet
305
7-05
× 48
Which
decimals?
2440
12 200
14 640
Step 2: Decide where to place the decimal point. There are two decimal places in 3.05
and one decimal place in 4.8. So there are a total of three decimal places in the
question. We write the answer, 14 640, with three decimal places: 14.640 = 14.64.
2 Evaluate 0.6 × 4.1.
Solution
41
× 6
246
Because there is a total of two decimal places in the question, we need to write the
answer, 246, with two decimal places. The answer is 2.46.
Exercise 7-08
1 Use the method shown above to calculate:
Example 14
a 3.05 × 4
b 1.02 × 7
c 2.001 × 9
d 17.1 × 2
e 10 × 2.25
f 3 × 4.20
g 6.95 × 5
h 1.0004 × 8
0.18 × 5
i
j 0.4 × 12
k 6 × 0.002
0.25 × 11
l
m 10.2 × 4
n 3 × 4.2
o 0.5 × 10
p 0.71 × 2
q 7 × 2.193
r 10.941 × 3
s 0.63 × 5
t 492 × 0.12
u 0.11 × 365
2 Calculate:
a 0.4 × 0.8
b 3.9 × 0.5
c 0.8 × 0.6
d 0.3 × 0.24
e 0.08 × 0.04
f 3.1 × 0.4
g 12.6 × 0.06
h 0.28 × 3
0.39 × 9
i
j 2.93 × 0.3
k 6.80 × 4
0.54 × 20
l
m 0.9 × 0.75
n 8.06 × 4.1
o 0.11 × 1.01
p 2.45 × 0.1
q 0.02 × 3.5
r 6.3 × 0.04
3 Find:
a 47.9 × 23
b 6.43 × 7.2
c 83.4 × 6.3
d 2.95 × 5.13
e 2.45 × 3.9
f 94.6 × 5.1
g 0.237 × 1.2
h 9.2 × 7.9
11.1 × 0.621
i
j 0.023 × 0.042
k 0.7521 × 3.6
321.2 × 8.1
l
217
DECIMALS
CHAPTER 7
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