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Unit 1.5

The document contains answers to exercises from the Cambridge O Level Mathematics coursebook, including various mathematical problems and their solutions. It covers topics such as voltage, amperes, fractions, percentages, and basic geometry. The answers are presented in a structured format with numerical values and comparisons.

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Areesh Gamerz
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34 views3 pages

Unit 1.5

The document contains answers to exercises from the Cambridge O Level Mathematics coursebook, including various mathematical problems and their solutions. It covers topics such as voltage, amperes, fractions, percentages, and basic geometry. The answers are presented in a structured format with numerical values and comparisons.

Uploaded by

Areesh Gamerz
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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CAMBRIDGE O LEVEL MATHEMATICS: COURSEBOOK ANSWERS

g 4 1 or 4.5 volts c 3.2 = 3 1


2 5
h 1
5 or 5.25 amperes
4 d 33% < 1
3
4 a 3 e 4 = 8
80 23 46
2 f 4 > 0.444
b 9
25
17 g 5 > 5
c 11 12
250
h − 9 < 7
d 3 10 10
10
e 42 2 a 0.5 0.06 0.59 0.466.. so
125
1 0.06, 14 , 49%, 1
f 30 2
150
b 0.75 0.08 0.7875 0.777 so
5 a 13
10 8%, 3 , 0.777, 63
4 80
b 20
3 c 1.45 1.4 1.54 1.412 so 7 , 24 , 145%, 1.54
5 17
c 9
2 d –2 –.002 –2.1 –2.083 so
d 5 −2.1, − 25 , − 2, 0.2%
2 12

e 3 3 a 1.625 1.857 1.7 1.69 so 13 , 1.7, 1 69 , 13


2 7 100 8
f 7 b 0.0297 0.037 0.032 0.033.. so
6
1 , 1 , 4 , 3
6 a 27.6 km 27 30 125 101

b $281.25 c 0.666.. 0.633.. 0.67 0.65 0.63 so


201 , 2 , 65%, 19 , 0.63
7 300 3 30

Activity Hours Minutes Simple fraction of d –0.9 0.25 –0.87 –1.003 0.909 so
working day 10 , 1 %, − 87 , −0.9, −1.003
11 4 100
1
Reports 2 40 3 13 = 0.65 < 11 > 16
4 a
20 16 25
25
Meeting 2 05 96 b 18.39% > 0.1832 > 9 < 37
50 200
3 1 2
Lunch 0 45 32 c 0.116 < 11.73% < >
7 17
5 5 Clement ($156), Andrew ($160),
Accounts 2 30 16 Beatrice ($162)
Total 8 00 1
6 Potatoes (800 g), carrots (500 g),
squash (400 g), onions (300 g)
8 a $1440
9
7 Side, diagonal, perimeter
b
20
8 Circumference, diameter, radius

Exercise 1.5 9 A = −17 °C, B = −20 °C, C = −18 °C,


D = −19 °C
1 a 1 1 > 1.5% Descending order: A, C, D, B
2
b 100% < 2.3 Ascending order: B, D, C, A

5 Cambridge O Level Mathematics – Chalmers & Saya © Cambridge University Press 2023

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