What is the LCM of 7 and 21?

Answer 1

Oh, what a happy little question! The LCM, or Least Common Multiple, of 7 and 21 is 21. You see, when we look at the multiples of 7 (7, 14, 21, 28...) and 21 (21, 42, 63...), we find that the smallest number they both share is 21. Just like painting, math can be a joyful journey of discovery!

Answer 2

LCM is 21, which is the multiple of the highest power of prime factors in the given numbers (3 x 7).
The LCM is 21.

Answer 3

The least common denominator would be 7. So the if it were a fraction being reduced. Seven goes into seven one time and seven goes into twenty-one three. So the fraction would be 3/1.