What is the least common multiple of 18 and 21?

Answer 1

The LCM of 18 and 21 is 126 because 18x7=126 and 21x6=126

So if you need help finding LCM you take the 2 numbers and write down the multiples of both of those numbers and see which number they both go into.

so here is how i got 126

18,36,54,72,90,108,126

21,42,63,84,105,126

The least common multiple of 18 , 21 = 126

Answer 2

Multiples of 18 are 3, 3, 2; multiples of 21 are 3 & 7. Therefore the LCM IS 3*3*2*7 = 126.

Answer 3

Prime factors of 18 are 3, 3, 2; prime factors of 21 are 3 & 7. Therefore the LCM IS 3*3*2*7 = 126.

Answer 4

126