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15 x 45 = (15 x 40) + (15 x 5)
15 x 40 = 600 15 x 50 = 750
840. 15 = 3 x 5 21 = 3 x 7 40 = 23 x 5 lcm = 23 x 3 x 5 x 7 = 840
3 x 5 = 15 2 x 3 x 5 = 30 2 x 2 x 2 x 5 = 40 2 x 2 x 2 x 3 x 5 = 120, the LCM
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