Question

timed problem
score: 3/10
find the greatest common factor of 4 and 20.
answer
4
1
5
2

Explanation:

Step1: List factors of 4

Factors of 4: $1, 2, 4$

Step2: List factors of 20

Factors of 20: $1, 2, 4, 5, 10, 20$

Step3: Identify common factors

Common factors: $1, 2, 4$

Step4: Select the largest common factor

Greatest common factor is the maximum value in $\{1,2,4\}$

Answer:

4