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From the results of Exploration Activity 3, it is found that on a number line,
(a) addition of (b) subtraction of
(i) positive integers is represented (i) positive integers is represented
CHAPTER
1 by moving towards the right by moving towards the left
(ii) negative integers is represented (ii) negative integers is represented
by moving towards the left by moving towards the right
Addition of positive integers Subtraction of positive integers

–2 –1 0 1 2 –2 –1 0 1 2

Addition of negative integers Subtraction of negative integers

5 Scan the QR Code or
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(a) 8 + (+3) (b) 5 + (–2) of addition and
(c) 2 – (+ 4) (d) –1 – (– 4) subtraction of integers.

(a) 8 + (+3) Move 3 units to the right Addition of positive
= 8 + 3 integers is represented
= 11 8 9 10 11 by moving towards
the right.

(b) 5 + (–2) Move 2 units to the le Coloured chips method
= 5 – 2 Addition of negative Yellow chips, + ,
integers is represented
= 3 3 4 5 by moving towards represent positive
integers and red chips,
the left. – , represent negative
integers.
(c) 2 – (+ 4) Move 4 units to the le Subtraction of positive For Example 5(b):
= 2 – 4 integers is represented + –
= –2 –2 –1 0 1 2 by moving towards 123 Represent
the left. + – zero
(d) –1 – (– 4) Move 4 units to the right +
= –1 + 4 Subtraction of negative +
integers is represented
= 3 –1 0 1 2 3 by moving towards
the right. +
Thus, 5 + (–2) = 3
Self Practice 1.2a

1. Solve each of the following:
(a) 6 + (+2) (b) – 4 + (–3) (c) 3 – (+2) (d) –2 – (– 4)
(e) –8 + (–2) (f) 6 – (+3) (g) 9 + (+4) (h) –5 – (–3)

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Chapter 1

01 TB Math F1.indd 8 10/20/16 11:55 AM