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

Question

1859 views around the world

You can reuse this answer
Creative Commons License

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#