year 8 maths

4D
Computation with decimals
221
Example 13a
Example 13b
9 Which of the following divisions would provide the same answer as the division question
62.5314 ÷ 0.03 ?
A 625.314 ÷ 3 B 6253.14 ÷ 3 C 0.625314 ÷ 3 D 625314 ÷ 3
10 Calculate:
a 24.54 ÷ 2 b 17.64 ÷ 3 c 0.0485 ÷ 5 d 347.55 ÷ 7
e 133.44 ÷ 12 f 4912.6 ÷ 11 g 2.58124 ÷ 8 h 17.31 ÷ 5
11 Calculate:
a 6.114 ÷ 0.03 b 0.152 ÷ 0.4 c 4023 ÷ 0.002 d 5.815 ÷ 0.5
e 0.02345 ÷ 0.07 f 16.428 ÷ 1.2 g 0.5045 ÷ 0.8 h 541.31 ÷ 0.4
12 Calculate:
a 13.7 + 2.59 b 35.23 − 19.71 c 15.4 × 4.3 d 9.815 ÷ 5
e 13.72 × 0.97 f 6.7 − 3.083 g 0.582 ÷ 0.006 h 7.9023 + 34.81
PROBLEM-SOLVING AND REASONING
13, 14, 17 14, 15, 17, 18
14–19
13 The heights of Mrs Buchanan’s five grandchildren are 1.34 m, 1.92 m, 0.7 m, 1.5 m , and 1.66 m .
What is the combined height of Mrs Buchanan’s grandchildren?
14 If the rental skis at Mt Buller were lined up end to end, they would reach from the summit of
Mt Buller all the way down to the entry gate at Mirimbah. The average length of a downhill ski is 1.5 m
and the distance from the Mt Buller summit to Mirimbah is 18.3 km . How many rental skis are there?
15 Design your own question similar to question 14 and ask a classmate to solve it.
For example, you might use the number of cars placed bumper to bumper from Sydney to Brisbane.
Carry out some research so that your decimal lengths are approximately accurate.
Cambridge Maths NSW
Stage 4 Year 8 Second edition
ISBN 978-1-108-46627-1 © Palmer et al. 2018
Cambridge University Press
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