Find the GCF of the given numbers. See Example 8. 15, 30 Reference Example 8 Fin...

Find the GCF of the given numbers. See Example 8.

15, 30

Reference Example 8

Find the GCF of 48 and 72.

Strategy We will begin by finding the prime factorizations of 48 and 72.

Why Then we can identify any prime factors that they have in common.

Step 2 The circling on the previous page shows that 48 and 72 have four common prime factors: Three common factors of 2 and one common factor of 3.

Step 3 The GCF is the product of the circled prime factors.

GCF (48, 72) = 2 . 2 . 2 . 3 = 24