You have to convert the denominators so they are each the same in order for you to add them. 10 is double 5, so multiply the numerator and denominator of 3/5 to get 6/10. Then add 6/10 to 3/10 and you get 9/10. Therefore, Heath and Janet ate 9/10 of the pizza.
first, lets make the fractions with the same den9minator so we can add them. Their lcm is 10. 3/5 would become 6/10. Janet ate 3/10. Together, they ate 9/10 of the pizza.
