Question

If a number has 20 as a factor, what other factors must it also have?

(a) 1, 2, 4, 5, 10, 20

(b) 1, 4, 5, 10, 20

(c) 1, 2, 5, 10, 20

(d) 1, 2, 4, 10, 20

Answer 1

If a number has 20 as a factor, it must also have the factors 1, 2, 4, 5, 10, and 20.

Step-by-step explanation:

To find the factors of a number, we need to determine which numbers can divide evenly into the given number. If a number has 20 as a factor, it means that 20 can divide evenly into that number.

The factors of 20 are 1, 2, 4, 5, 10, and 20.

Therefore, if a number has 20 as a factor, it must also have the factors 1, 2, 4, 5, 10, and 20.

From the options given, the correct answer is (a) 1, 2, 4, 5, 10, 20.