Question

Hence, the LCM of 65, 115 and 130 = 5 x 13 x 2 x 23 = 2,990.
Checkpoint 3
1. Find the LCM of each of the following group of numbers using prime factorisation method.
(a) 12,30
(b) 90, 120
(c) 108, 144
(d) 96, 120
(e) 76,57
(f) 72,90
(g) 70, 105
(h) 20, 30, 40
(0) 72,96, 108
0) 75, 90, 125
2. Find the LCM of each of the following group of numbers using common division method.
(a) 48,72
(b) 75,90
(c) 24, 36, 54
(d) 72,90, 120
(e) 32, 60, 84 (f) 56, 84, 133
3. Find the smallest number that is exactly divisible by 12, 15 and 20.
4. Find the smallest number which leaves a remainder of 5 when divided by 24, 32 and 42.
Skill Build 3
that ir divisible by 15 20 and 25.
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Answer 1

Answer of question no. 3 is 60

12= 2×2×3

15=3×5

20=2×2×5

LCM = 2×2×3×5= 60

tq