To find the common factors of the numbers 20, 25, and 40, we first determine the individual factors of each number.
The factors of 20 are: 1, 2, 4, 5, 10, 20.
The factors of 25 are: 1, 5, 25.
The factors of 40 are: 1, 2, 4, 5, 8, 10, 20, 40.
Next, we identify the factors that appear in all three lists:
- 1
- 5
Thus, the common factors of 20, 25, and 40 are 1 and 5. These numbers can be used to evenly divide each of the three numbers, which is the characteristic of common factors.