Solve the following with suitable and short-cut method:
(a) 86 × 5
(b) 86 × 15
(c) 86 × 25
(d) 86 × 35
(e) 86 × 50
(f) 96 × 125
(g) 96 × 250
(h) 112 × 625
(a) 86 × 5 = 86 × (10/2) = 43 × 10 = 430
(b) 86 × 15 = 86 × (30/2) = 43 × 30 = 43 × (10 × 3) = 430 × 3 = 1290
(c) 86 × 25 = 86 × (100/4) = 43 × 50 = 43 × (10 × 5) = 430 × 5 = 2150
(d) 86 × 35 = 86 × (70/2) = 43 × 70 = 43 × (10 × 7) = 430 × 7 = 3010
(e) 86 × 50 = 86 × (100/2) = 43 × 100 = 4300
(f) 96 × 125 = 96 × (1000/8) = 12 × 1000 = 12000
(g) 96 × 250 = 96 × (1000/4) = 24 × 1000 = 24000
(h) 112 × 625 = (112 × 10000/16) = 7 × 10000 = 70000