Question

here are the factors of 18 and 45.
18 : ①, 2, ③, 6, ⑨, 18
45 : ①, ③, 5, ⑨, 15, 45
all of the common factors have been circled.
what is the greatest common factor?

Explanation:

Step1: Identify common factors

From the circled numbers, the common factors of 18 and 45 are 1, 3, 9.

Step2: Determine the greatest

Among 1, 3, 9, the greatest number is 9.

Answer:

9