Unit 1 (The Number System), Chapter 4: Factors and Greatest Common Factor

What are the factors of 60?

1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, and 60.

What are the factors of 12?

1, 2, 3, 4, 6, and 12

Find the greatest common factor of 33 and 74.

1.

Find the greatest common factor of 6 and 20.

2.

Find the greatest common factor of 24 and 96.

24.

Sara has 8 red-colored pens and 20 yellow-colored pens. She wants to create groups of pens such that there are the same number of red-colored pens and yellow-colored pens in each group and there are no pens left over. What is the greatest number of groups that she can create?

4 groups. (Each group has 2 red-colored pens and 5 yellow-colored pens.)

Is 3,645,211 divisible by 10?

No, because it does not end in a 0.

Is 348 divisible by 2?

Yes, because 348 ends in an even number.

Is 786 divisible by 3?

Yes, because 7 + 8 + 6 = 21, and 21 is divisible by 3.

Is 936 divisible by 9?

Yes, because 9 + 3 + 6 = 18, and 18 is divisible by 9.