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How do you perform computations involving LEARNING
combined basic arithmetic operations of STANDARDS CHAPTER
positive and negative decimals? Perform computations
involving combined 1
basic arithmetic
14 operations of positive
and negative decimals
Evaluate each of the following:
by following the order
(a) 3.5 – (– 6.5) × 0.2 of operations.
(b) (7.23 + 2.77) ÷ (–0.8)
(c) –3.7 + (4.25 + 2.85) × 0.3

Multiplication is Follow the order of
(a) 3.5 – (– 6.5) × 0.2 = 3.5 – (–1.3) performed first. operations
= 3.5 + 1.3 ( )
= 4.8
× or ÷
Calculation in
(b) (7.23 + 2.77) ÷ (– 0.8) = 10.0 ÷ (– 0.8) the brackets is + or –
= –12.5 performed first.

Calculation in
the brackets is
(c) –3.7 + (4.25 + 2.85) × 0.3 = –3.7 + (7.1 × 0.3) performed first
= –3.7 + 2.13 followed by
= –1.57 multiplication.

Self Practice 1.4c

1. Evaluate each of the following:
(a) 4.7 – 7.8 × 0.3 (b) (8.36 + 3.89) ÷ (–0.28)
(c) –3. 48 + (7.36 + 1.24) × 0.6 (d) 0.36 – (–8.67) ÷ (– 0.3) + 0.82
1. 44
(e) –2.65 – + 3.22 (f) 2.34 + 3.1 × (–0.1) + 0.2
–1.2

How do you solve problems?
LEARNING
STANDARDS
Solve problems
involving positive and
The price of the stock of a company was RM2.05 at a certain negative decimals.
time. The price hiked by RM0.32, then subsequently dropped
RM0.28 every hour for the next three hours. Calculate the
final price of the stock.

21
Rational Numbers

01 TB Math F1.indd 21 10/20/16 11:55 AM