Question

Least commin multiple of 3 and 21

Answer 1

Answer: 21

Step 1: List a few multiples of 3 (3, 6, 9, 12, 15, 18, 21, . . . ) and 21 (21, 42, 63, 84, 105, . . . . )

Step 2: The common multiples from the multiples of 3 and 21 are 21, 42, . . .

Step 3: The smallest common multiple of 3 and 21 is 21.