Subtract Unlike Fractions Unit 1 Lesson 8 Subtract Unlike Fractions

- = We first need to give both fractions a common denominator in order to subtract more easily. 12 will be the common denominator.

Mathboards Mrs. Bush has 5/6 feet of a fruit roll up. She eats 2/3 feet of it. How much fruit roll up does she have left? Circle 5/6 on the sixths fraction bar on your mathboard. Try to subtract 2/3. How can you do it without using the thirds fraction bar?

Rewriting Fractions We rewrite 2/3 as the equivalent fraction 4/6. The problem then becomes 5/6 – 4/6 We can easily subtract now since we have common denominators.

Compare and Subtract Mrs. Jenkins ate 3/8 of an apple pie, made from scratch my Miss V of course! Mrs. Petro ate 5/12 of the same pie. Who ate more? How much more did she eat?

Mrs. Jenkins ate 3/8 of an apple pie. Mrs Mrs. Jenkins ate 3/8 of an apple pie. Mrs. Petro ate 5/12 of the same pie. Who ate more? How much more did she eat? This problem has two steps. 1st step- Compare the fractions to see who ate more 2nd step- Subtract the fractions to see how much more that person ate. Both of these steps are made easier by creating fractions with common denominators.

Mrs. Jenkins ate 3/8 of an apple pie. Mrs Mrs. Jenkins ate 3/8 of an apple pie. Mrs. Petro ate 5/12 of the same pie. Who ate more? How much more did she eat? Use a denominator of 24, since both 8 and 12 are factors of 24. We will see that Mrs. Jenkins ate 9/24 of the pie Mrs. Petro ate 10/24 of the pie, which is more than 9/24. We will then subtract to see how much more Mrs. Petro ate.

Compare and Subtract

Team Pair Solo

1-Which fraction is greater 1-Which fraction is greater? 2-What is the difference of the two fractions?

Solve