### Home > MC1 > Chapter 7 > Lesson 7.2.3 > Problem7-70

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 $24$

Use the Lesson 7.2.2 Math Notes box to help you with these problems.

LCM is $24$. GCF is $3$.

1. $7$ and $9$

Again, refer to the Math Notes box.

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

2. $15$ and $12$

Refer to the Math Notes box.

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