1.1 Directed numbers © 2020 Cambridge University Press Unit 1 Integers, powers and roots 1/2 SOLUTIONS TASK 1 a) –5.5 + 6.2 = 0.7 b) –2.8 – (–4.6) = 1.8 c) 1.9 – 7.3 = –5.4 d) –7.6 – (–5.2) = –2.4 e) –8.6 – (–5.8) + (–1.7) = –4.5 2 i) –4.8 + [ 2.3 ] = –2.5 ii) –6.2 – [ –1.5 ] = –4.7 iii) 5.6 + [ –9.5 ] = –3.9 3 a) (–0.5) × 8 = –4 b) (–2.4) × (–0.2) = 0.48 c) 9.6 ÷ (–6) = –1.6 d) 25.5 ÷ (–0.5) = –51 e) (–0.9) × (–0.03) = 0.027 f) (–0.3) 2 = 0.09 g) (–0.5) 3 = – 0.125 h) (–2.5) × 6 ÷ (–0.5) = 30 1 3.2 – = 2 4) – 0.2) × ( – ( j) = 4.8 0.6) – 0.4) × ( – ÷ ( 3.2 i) Revision Worksheet Level 8