What is the LCM (Lowest Common Multiple) of 16 and 20?

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Answer 1 · 2017-10-12T03:55:20

$L C M =2*2*3*5=$ 60

Let us first factorise both the terms $20 and 15.$

$20=2*2*color(red)5$
$15=3*color(red)5$

5 has repeated in both the terms and hence included once in LCM.

$L C M (15,20)=2*2*5*3=$ 60

Answer 2 · 2017-10-12T12:18:09

$lcm(16,20)=60$

Another way is to simply list the multiples of the numbers and pick out the common ones

$"15:{15,30,45color(red)(,60),75,90,105,color(red)(120),.....}$

$"20:{20,40color(red)(,60),80,100,color(red)(120),...}$

common multiples: $" "{60,120,..}$

$lcm(16,20)=60$