Question

Find each of the following products:
(a) 3 × (–1)
(b) (–1) × 225
(c) (–21) × (–30)
(d) (–316) × (–1)
(e) (–15) × 0 × (–18)
(f) (–12) × (–11) × (10)
(g) 9 × (–3) × (– 6)
(h) (–18) × (–5) × (– 4)
(i) (–1) × (–2) × (–3) × 4
(j) (–3) × (–6) × (–2) × (–1)

Answer 1

Multiplication of integers
(a) 3 × (-1) = -3 × 1 = -3
(b) (-1) × 225 = -1 × 225 = -225
(c) (-21) × (-30) = (-) × (-) × 21 × 30 = 630
(d) (-316) × (-1) = (-) × (-) × 316 × 1 = 316
(e) (-15) × 0 × (-18) = 0 [∵ a × 0 = a]
(f) (-12) × (-11) × (10) = (-) × (-) × 12 × 11 × 10 = 1320
(g) 9 × (-3) × (-6) = (-3) × (-6) × 9 = (—) × (-) × 3 × 6 × 9 = 162
(h) (-18) × (-5) × (-4) = (-) × (-) × (-) × 18 × 5 × 4 = -360
(i) (-1) × (-2) × (-3) × 4 = (-) × (-) × (-) × 1 × 2 × 3 × 4 = -24
(j) (-3) × (-6) × (-2) × (-1) = (-) × (-) × (-) × (-) × 3 × 6 × 2 × 1 = 36