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