Question

Find the LCM of first 5 multiples of 4.

• A. 100
• B. 480
• C. 520
• D. 220

Answer 1

The correct option is B 480

First five multiples of 4 are 4, 8, 12, 16 and 20.

$\begin{array}{cc}2& 4,8,12,16,20\\ 2& 2,4,6,8,10\\ 2& 1,2,3,4,5\\ 2& 1,1,3,2,5\\ 2& 1,1,3,1,5\\ 3& 1,1,1,1,5\\ 5& 1,1,1,1,1\end{array}$

LCM = 2 × 2 × 2 × 2 × 2 × 3 × 5 = 480