Question

here are the factors of 15 and 30.
15 : ① ③ ⑤ 15
30 : ① 2, ③ ⑤ 6, 10, 15, 30
all of the common factors have been circled.
what is the greatest common factor?

Explanation:

Step1: Identify common factors

From the circled factors of 15 (1, 3, 5, 15) and 30 (1, 3, 5, 15), the common factors are 1, 3, 5, 15.

Step2: Find the greatest common factor

Among 1, 3, 5, 15, the largest number is 15.

Answer:

15