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6

Evaluate each of the following:
(a) –5 × (– 4) (b) –6 × 4 (c) 6 ÷ (–2) (d) –12 ÷ (–2)
CHAPTER
1

(a) –5 × (– 4) (b) –6 × 4 (c) 6 ÷ (–2) (d) –12 ÷ (–2)
= +(5 × 4) = –(6 × 4) = –(6 ÷ 2) = +(12 ÷ 2)
= 20 = –24 = –3 = 6

Self Practice 1.2b

1. Solve each of the following:
(a) –6 × (–3) (b) –7 × 2 (c) 4 × (–8) (d) 8 × (–6)
(e) –12 ÷ 3 (f) –18 ÷ (–6) (g) 15 ÷ (–5) (h) –20 ÷ 4

How do you perform computations involving LEARNING
combined basic arithmetic operations of integer? STANDARDS
Perform computations
When performing a computation involving combined involving combined basic
operations of integers, follow the order of operations below. arithmetic operations of
integers by following the
Brackets ( ) × or ÷ + or – order of operations.

From left to right From left to right

7

Solve each of the following: Brackets are also a notation
(a) –8 × (–2 + 3) (b) 7 + 2(–3) for multiplication.
–12 + (–16)
(c) 4 – 12 ÷ (–2) + (–1) (d)
–22 – (–24)
Smart
Smart
(a) –8 × (–2 + 3) (b) 7 + 2(–3) For Example 7(a),
= –8 × (1) = 7 + 2 × (–3)
press (–) 8 × (
= –8 = 7 + (– 6)
= 7 – 6 (–) 2 + 3 ) =
= 1
For Example 7(d),
–12 + (–16)
(c) 4 – 12 ÷ (–2) + (–1) (d) press ( (–) 1 2 +
= 4 – (– 6) – 1 –22 – (–24) (–) 1 6 ) ÷ (
= 4 + 6 – 1 = –12 – 16 (–) 2 2 – (–) 2 4
= 9 –22 + 24 ) =
–28
=
2
= –14

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Chapter 1

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