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Sixteen 4 x 20/5 = 4 x 4 = 80/5 = 16
5 x 20 = 100
20/(5 x 2) + 3 = 5 20/10 + 3 = 5 2 + 3 = 5
3/20 = 3/5 x 1/4 0.25 x 3/5 = 3 x 0.05 = 0.15 = 15/100 = 3/20
90 = 2 x 3 x 3 x 5 20 = 2 x 2 x 5 HCF = 2 x 5 = 10 LCM = 90 x 20 / 10 = 180