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Home > MC1 > Chapter 7 > Lesson 7.2.3 > Problem 7-70


Find the least common multiple and the greatest common factor of the following pairs of numbers. In other words, find the smallest number that is a multiple of both of the numbers in the pair.

  1. 3 and 24

  1. 7 and 9

  2. 15 and 12

Use the Math Notes box below to help you with these problems.

LCM is 24. GCF is 3.

Again, refer to the Math Notes box.

7 is a prime number, which means its only factors are 1 and itself.

Refer to the Math Notes box.

LCM is 60. Can you find the greatest common factor?