Question

4
Practice Set 13
(iv) 10, 15, 20
(viii) 12, 15, 45
(v) 45, 86
(ix) 63, 81
Find the LCM.
(i) 12, 15 (ii) 6, 8, 10 (iii) 18, 32
(vi) 15, 30, 90
(vii) 105, 195
(x) 18, 36, 27
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Answer 1

Answer:

first understand how to find the LCM. before LCM u have to know about Prime factorisation

if I take vi) 15, 30, 90

15 = 3x5

30= 2x3x5

90= 2x3x3x5

so now LCM

= common factor in three X common factor in two X remaining

= (3x5) X (2) X 3

= 90

u can practice other questions