**Step 1:**Find prime factors and express them in exponential form

**Step 2:**Start with the smallest prime factor and pick the one with highest power

**Step 3:**Multiply all the terms of Step2 to get the LCM

**Example:**Find the L.C.M. of 24, 81 and 400*Step1:*

*Factors of 24 = 2 x 2 x 2 x 3 = 23 x 3*

*Factors of 162 = 2 x 3 x 3 x 3 x 3 = 2 x 34*

*Factors of 400 = 2 x 2 x 2 x 2 x 5 x 5 = 24 x52*

*Step 2:*

*L C M =24 x 34 x 52*

*Step 3:*

*LCM = 16 x 81 x 25 = 32400*