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1.5 Open the folder downloaded from page vii for extra
questions of Mastery Q 1.5.
1. Evaluate each of the following.
CHAPTER
1 6 1 2
2
2 1
(a) 2.5 + (–8) ÷ × 3.5 (b) 1 + 3.2 × 2 – 5. 4 – ÷ 0.04
5 4 3
2. For each of the following number patterns, complete it using suitable
rational numbers.
7 1 1
(a) –2. 4, – , –4.6, , (b) – , –0.25, , – , –0.03125
2 2 16
3. For each of the following, complete it using a suitable rational number.
2 3
(a) 6.8 ÷ – 4.62 = × 0.01 (b) 3.76 + × (–4.5) = × 0.5
5 4

4. Ishak, Jia Kang and Suresh went mountain-climbing together. At a certain instance,
1
Ishak was at a level 1. 45 m higher than Jia Kang while Suresh was at a level 2 m
3
lower than Jia Kang. Ishak, Jia Kang and Suresh had climbed 1.25 m, 0.5 m and
3
3 m respectively. Find the positions of Jia Kang and Suresh now with reference to
4
the position of Ishak.

RATIONAL NUMBERS

Integers Fractions Decimals

• Positive integers • Positive fractions • Positive decimals
1 7
1, 2, 3, 4, … Example: , , 1 1 Example: 0.5, 4.3, 3.24
2 4 5
• Zero, 0 • Negative decimals
• Negative fractions
• Negative integers 1 9 , 1 Example: – 0.1, –5.5, –7.65
…, – 4, –3, –2, –1 Example: – , – – 4 2
2
3

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Chapter 1
Chapter 1

01 TB Math F1.indd 26 10/20/16 11:55 AM