3. Find the LCM and HCF
of the following integers by applying the prime factorisation
PI
method.
(i) 12, 15 and 21 (ii) 17, 23 and 29
(iii) 8, 9 and 25
Answers
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LCM and HCF are
1) 12= 2×2×3
15=3×5
21=3×7
HCF=3
LCM= 2²×3×5×7
=2×2×3×5×7
=420
2) 17= 1×17
23= 1×23
29=1×29
HCF= 1
LCM=17×23×29
=11339
3) 8= 2×2×2
9=3×3
25=5×5
HCF=1
LCM= 1800
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