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Question

Write the first five multiples of 10 and 20. Highlight their common multiple and find their LCM.

Solution
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Multiples of 10:
10,20,30,40,50
Multiples of 20
20,40,60,80,100
Common multiples of 10 and 20 are 20,40

To find LCM of 20 and 40, we need to write these numbers in the form of product of their prime factors:

20=2×2×5=22×5
40=2×2×2×5=23×5
LCM(20,40)=2×2×2×5
=40 Ans

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