Question

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determine the LCM of 1)78,91 2)12,15,45 3)6,15,18,30

Answer 1

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(1) 78 , 91

13 [ 78 , 91
°°°°°°°°6 , 7

LCM of 78 and 91 = 13 × 6 × 7 = 546

(2) 12 , 15 , 45

3 [ 12 , 15 , 45
5 [ 4 , 5 , 15
°°°°°4 , 1 , 3

LCM of 12 , 15 and 45 = 3 × 5 × 4 × 1 × 3 = 180

(3) 6 , 15 , 18 , 30

2 [ 6 , 15 , 18 , 30

3 [ 3 , 15 , 9 , 15

5 [ 1 , 5 , 3 , 5

*°°°1 , 1 , 3 , 1

LCM of 6 , 15 , 18 and 30 = 2 × 3 × 5 × 3 = 90.

Answer 2

1) 3×7×7×13=1911
2) 2×2×3×3×5=180
3) 3×3×5×2=90