Angie baked 100 cookies, and 20 brownies. She wants to split them into equal groups for the bake sale. Each group must have the same number of cookies and brownies, with none left over. What is the greatest number of groups she can make?
You need the greatest common factor of the two numbers. In this case, 20 is a factor of 100, meaning that Angie can make 20 groups, each with 5 cookies and 1 brownie.
