1. Subtract Unlike Fractions
Unit 1 Lesson 8
Subtract Unlike Fractions

2. =
We first need to give both fractions a common denominator in order to subtract more easily.
12 will be the common denominator.

3. 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?

4. 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.

5. 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?

6. 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.

7. 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.

8. Compare and Subtract

9. Team Pair Solo

10. 1-Which fraction is greater
1-Which fraction is greater? 2-What is the difference of the two fractions?

11. Solve