Question

What is the least common multiple (LCM) of 5 and 7?

Answer 1

Answer: 35.

7: 7, 14, 21, 28,35

5: 5, 10, 15,20, 25, 30, 35

Answer 2

35

Explanation:

Express each number in terms of its prime factors

5 = 5 and 7 = 7

Then multiply each factor the greatest number of times it occurs in either number.

Both factors occur only once, thus

LCM = 5 × 7 = 35