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Self Practice 1.5b

1. Evaluate each of the following: CHAPTER
3 3 17 1
1
2 1
1
2
(a) –0.6 + × –1 2 (b) – + 0.8 ÷ – 1.3 1
4 5 20 2
2 5 8 13 1
1
1
(c) 1.125 + 1 – 2 × – 2 (d) –3.25 ÷ – –2 2 × 0.25
3 6 27 15 6
How do you solve problems? LEARNING
STANDARDS
Solve problems involving
rational numbers.
3
Noriah has a savings of RM120. She donates of her
8
savings to flood victims. She then buys a pair of school shoes
for RM25.60. Calculate the balance she still has.
An accountant uses
the knowledge of
3 rational numbers to do
Amount donated = × RM120.00
8 efficient computations.
= RM45.00
Balance she still has = RM120.00 – RM45.00 – RM25.60
= RM49. 40

Self Practice 1.5c

1. A company donates to charity every year as its contribution to society. If the company
2
makes a profit in that year, of the profit will be allocated for donation.
9
If the company incurs a loss, the company will also allocate 0.05 of the loss for
donation. If the company makes a profit of RM43.2 million in a certain year and
incurs a loss of RM2.5 million and RM6.5 million respectively in two consecutive
years, calculate the total donations the company would have allocated for charity in
those three years.
2. A roll of ribbon is used to tie 12 gifts which will be given to teachers on Teacher’s

Day. Every gift requires a length of 1.85 m. After tying all the gifts, it was found that
2 of the ribbon had been used. The remaining ribbon was cut into 12 pieces of the
3
same length. Calculate the length of each piece of ribbon that had been cut.

25
Rational Numbers

01 TB Math F1.indd 25 10/20/16 11:55 AM