Q. 23.9( 52 Votes )

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Answer :

I. 12,15 and 21

12 = 22×3

15 = 3×5

21 = 3×7

LCM = 22×3×5×7 = 420

HCF = 3

II. 17,23 and 29

17 = 1×17

23 = 1×23

29 = 1×29

LCM = 1×17×23×29 = 11339

HCF = 1

III. 8, 9 and 5

8 = 23

9 = 32

5 = 1×5

LCM = 23×32×5 = 360

HCF = 1

IV. 72 and 108

72 = 23×32

108 = 22×33

LCM = 25×35 = 7776

HCF = 22×32 = 4×9 = 36

V. 306 and 657

306 = 2×32×17

657 = 32×73

LCM = 2×32×17×73 = 22338

HCF = 32 = 9

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