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# Chap01

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### Chap01

1. 1. T ER AP 1 Directed NumbersCH 1. Evaluate each of the following. (a) 13 × (–10) (b) –7 × 3 = = 2. Solve the following problems. (a) Palm oil is pumped into an empty tanker at 200 litres per minute. How much palm oil is in the tanker after 5 minutes? (b) Siti takes 4 vitamin tablets a day from a box of vitamin tablets. How many tablets are eaten by Siti after 30 days? 3. Find the value for each of the following. (a) –144 ÷ (–12) (b) –28 ÷ 4 = = 4. Solve the following problems. (a) During a TV Quiz open to home viewer, a total of RM2884 was given out in 7 minutes. How much money was given in a minute? (b) 210 m3 water was pumped out from a swimming pool in 12 minutes. How much water was pumped out in 2 minutes? 5. Find the values for each of the following. (a) 15 – (–4) + (–7) (b) –8 + 0 – (–15) = = (c) 8 + 2 – (–10) (d) –6 + 5 – (–1) = = (e) 4 – (–2) – 17 (f) 15 – (–2) – (–3) = = (g) 25 – 2 + (–9) – 1 (h) 3 + (–8) + (–7) = = (i) –6 + (–5) + (–7) – (–4) (j) 5 + (–8) – (–9) + 7 = = 1 © Penerbitan Pelangi Sdn. Bhd.
2. 2. 6. Find the product for each of the following. (a) –3 × (–8) × (–4) (b) 6 × (–6) × 7 = = 7. Compute each of the following. (a) 168 ÷ (–7) ÷ (–4) (b) 150 ÷ (–5) ÷ 6 = = 8. Compute each of the following. (a) 6 × (–12) ÷ 9 (b) 15 × (–4) ÷ 12 = = 9. Evaluate each of the following. (a) –7 + 18 ÷ (–2) (b) –19 × 3 – 47 = = (c) 21 ÷ (–7) + (–12) (d) 16 + 0 × (–15) = = (e) 21 – 24 ÷ (–3) – 10 (f) 81 ÷ (–9) – (–5) × 4 = = (g) 30 ÷ (–5) × 8 – (–13) = 1 0. Solve the following problems. (a) (–15) is subtracted from (– 42). The difference is divided by 9. Find the quotient. (b) Hot-air is pumped into a hot-air balloon at 50 ml per second. Some hot-air leaks out 1 at 15 ml per second. How much hot-air is there after — hour? 21 1. Complete the following number line. –4 –3 –21 2. Arrange the following fractions in descending order. 1 1 2 1 1 –4 — , –2 — , –3 — , –1 — , –2 — 4 4 5 2 2 7 1 3. Evaluate –5 — + 1–2 — 2 and simplify the answer to the lowest term.1 12 3© Penerbitan Pelangi Sdn. Bhd. 2
3. 3. 1 4. Evaluate each of the following and simplify the answers to the lowest term. 1 1 (a) –3 — × 1 — 7 1 (b) — ÷ 1– — 2 1 1 (c) –1 — ÷ 1–1 — 2 8 15 12 4 2 8 = = = 7 1 (d) – — ÷ 1 — 8 2 (e) — ÷ 1– — 2 1 1 (f) 2 — ÷ 1–6 — 2 24 6 15 5 7 4 = = =1 5. Complete the following number line. –8 –71 6. Arrange the following decimals in ascending order. 3.2, –2.5, –3.6, 4.1, –1.21 7. Evaluate each of the following. (a) –4.1 + (–1.6) (b) –4.61 – (–8.32) (c) –(–6.32) – 1.48 = = = (d) –(2.15) – (–3.82) (e) –0.1 – (–0.08) (f) –3.24 + (–8.178) = = =1 8. Evaluate the following. (a) 1.8 ÷ (–0.2) (b) –4.92 ÷ 1.2 (c) –6.3 × 2.6 = = = (d) –11.4 ÷ (–5.7) (e) 24.96 ÷ (–3.2) (f) –17.3 × –0.4 = = =1 9. Evaluate each of the following. 1 (a) 1.3 – 7 — 7 (b) — + (–6) 5 15 = =2 0. Evaluate each of the following. 3 (a) –5 — ÷ 1.2 2 (b) –13.5 × 1 — 5 3 = = 3 © Penerbitan Pelangi Sdn. Bhd.
4. 4. 2 1. Evaluate the following. 2 1 (a) 31 — – (–0.7)4 × 2 — 1 1 (b) 4.811 — – 22 ÷ 8 — 5 6 6 3 = =2 2. Mr. Chan’s shop lost 3.5% of his customers every month for 5 months. After a sales 3 promotion, the customers increased by 2 — % per month for the next 7 months. What is 5 the average change of customers in that year?© Penerbitan Pelangi Sdn. Bhd. 4