The LCM of 21 and 18 is 126.
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LCM of 2 6 and 18 is 18.
The LCM of 18 and 21 is 126 because 18x7=126 and 21x6=126So 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 12618,36,54,72,90,108,12621,42,63,84,105,126The least common multiple of 18 , 21 = 126
The LCM is 18.
The LCM is 36.
The LCM is 90.