Answer:
The GCF is 45
Explanation:
Step 1: Find the prime factorization of each number
Prime Factorization of 90: 2 * 3 * 3 * 5
Prime Factorization of 45: 3 * 3 * 5
Step 2: Multiply the numbers that they have in common
Both numbers have 3, 3, and 5 in common.
So we just multiply them: 3 * 3 * 5 = 45
Therefore, the GCF of 90 and 45 is: 45
Answer: The GCF is 45