Question

LCM of 21,28 by using prime factorization method

Answer 1

3|21
7|7
7
21 = 3 × 7 × 7

2|28
2|14
7|7
7
28 = 2 × 2 × 7 × 7

LCM of 21 and 28 = 7 × 2 × 2 × 3 = 84

Answer 2

Hey.. Here's your answer...

7 I 21, 28

3 I 3, 4

2 I 1, 4

2 I 1, 2

I 1, 1

LCM = 7 × 3 × 2 × 2 = 84

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