The common factors of 24 and 48 are 1, 2, 3, 4, 6, 8, 12, and 24.
Factors are the numbers that can be multiplied with another number, to equal the product stated. Common factors are the factors that both stated products have.
Factors of 24: 1, 2, 3, 4, 6, 8, 12, and 24.
Factors of 48: 1, 2, 3, 4, 6, 8, 12, 16, 24, and 48.
Finding all the shared factors, will give you a final answer of 1, 2, 3, 4, 6, 8, 12, and 24.
I hope this helps!