Using prime factorisation, fi nd the HCF and LCM of:
(i) 8, 9, 25 (ii) 12, 15, 21 (iii) 17, 23, 29
(iv) 24, 36, 40 (v) 30, 72, 432 (vi) 21, 28, 36, 45
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Answer:
i) 8= 2×2×2
9= 3×3
25= 5×5
H.C.F. = 1
L.C.M.= 2×2×2×3×3×5×5
=1,800
ii) 12= 2×2×3
15= 3×5
21= 3×7
H.C.F. = 3
L.C.M. = 2×2×3×5×7
= 420
iii) 17= 17×1
23= 23×1
29= 29×1
H.C.F. = 1
L.C.M.= 17×23×29
= 11,339
iv) 24= 2×2×2×3
36=2×2×3×3
40=2×2×2×5
H.C.F. = 2×2=4
L.C.M. = 2×2×2×3×3×3×2×5
=2,160
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