Question 183

Find the LCM of 160, 170 and 90.

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Solution

LCM of 160, 170 and 90 by division method,

$\begin{matrix} 2 & 160, 170, 90 2 & 80, 85, 45 2 & 40, 85, 45 2 & 20, 85, 45 2 & 10, 85, 45 3 & 5, 85, 45 3 & 5, 85, 15 5 & 5, 85, 5 17 & 1, 17, 1 1, 1, 1 \end{matrix}$

LCM of 160, 170 and 90 = $(2^{5}) \times (3^{2}) \times 5 \times 17 = 24480$

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Question 37
LCM of 10, 15 and 20 is

(A) 30
(B) 60
(C) 90
(D) 180

Question 2 (ii)
Find the LCM and HCF of 510, 92 and verify that LCM $\times$ HCF = product of the two numbers.

L C M

80, 64

L C M

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