b) 20 × 5 = 20×5 = 100 = 10
c) 72 × 2 = 72×2 = 144 = 12
d) 20 × 180 = 20×180 = 3 600= 60
e) 1200 : 3 = 1200:3 = 400 = 20
f) 50 : 2 = 50:2 = 5
g) 98/2 = 98:2 = 49 = 7
h) 75/3 = 25 = 5
