Question

Find HCF and LCM of 40'45'and 75

Answer 1

LCM -

2 I 40, 45, 75

2 I 20, 45, 75

2 I 10, 45, 75

3 I 5, 45, 75

3 I 5, 15, 25

5 I 5, 5, 25

5 I 1, 1, 5

  I 1, 1, 1

LCM = 2 × 2 × 2 × 3 × 3 × 5 × 5

LCM = 1800

HCF -

40 = 2 x 2 x 2 x 5

45 = 3 x 3 x 5

75 = 3 x 5 x 5

Common factor(s) = 5

HCF = 5

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Answer 2

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