Answer Key For Extra Practice 2.2

BLM 2–7 Section 2.2 Extra Practice
1. a) i) Example: 1 + (–3) = –2 ii) –2.58
b) i) Example: –7 + –8 = – 15 ii) –14.92
c) i) Example: 8 – 5 = 3 ii) 2.45
d) i) Example: –3 + 4 = 1 ii) 1.38
e) i) Example: –1 + 2 = 1 ii) 1.241
f) i) Example: 0.5 + 0.1 = 0.6 ii) 0.675
2. a) i) Example: –4 × 7 = –28 ii) –27.3
b) i) Example: –5 × (–9) = 45 ii) 47.43
c) i) Example: –2 ÷ (–1) = 2 ii) 1.2
d) i) Example: 36 ÷ (–4) = –9 ii) –8.5
e) i) Example: 3 × (–4) = –12 ii) –11.34
f) i) Example: –9 ÷ (–0.3) = 30 ii) 26.758
g) i) Example: –6 ÷ 20 = –0.3 ii) –0.273
h) i) Example: –0.3 × (–0.9) = 0.27 ii) 0.264
3. a) i) Example: –6 + (–1) ÷ (–1 + 0) = –5
ii) –5.4
b) i) Example: –2 × (–3) + (–1) × 2 = 4
ii) 5.016
c) i) Example: –6 × (–4) – 1 ÷ 0.5 = 22
ii) 24.04
4. a) 135.25 + (–159.15) = –23.90
b) Camille’s account balance is –$23.90.
5. a) (–12) + (+4) + (–11) + (+9) + (–3) = –13 b) The temperature on Friday was –13 °C.
6. a) 126(2.00) – (130)(1.45) = 63.50
b) The student council earned $63.50 on their birthday card sale.
7. a) 45 – (–63) = 108
b) The difference between the hottest day and coldest day in Canada is 108 °C.
8. a) i) 5.8 – (–8.1) = 13.9 ii) –8.1, –3.2, –0.5, 0.6, 1.8, 2.5, 5.8; median: 0.6 iii) –8.1 + (–3.2) + (–0.5) + 0.6 + 1.8 + 2.5 + 5.8 = –1.1; –1.1 ÷

7 ≈ – 0.16 b) i) 14.2 – (–13.7) = 27.9
ii) –13.7, –7.3, 0, 4.1, 9.1, 12.3, 14.2; median: 4.1 iii) –13.7 + (–7.3) + 0 + 4.1 + 9.1 + 12.3 + 14.2 = 18.7; 18.7 ÷ 7 ≈ 2.67

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