Reteaching
Name
12-3
Modeling Subtraction
of Fractions
Karla made a pizza and cut it into 10 slices. She ate two slices.
What fraction of the pizza is left?
You can use a model to subtract fractions.
Karla’s pizza is divided into 10 slices. One way to show
10 = 1 whole pizza. Karla ate two slices of the pizza.
this is __
10
Cross out two of the slices. Count the number of slices left.
8 of the pizza left.
There are 8 slices or __
10
10
8
2 = ___
___
− ___
10
10
10
Write the answer in simplest form, if possible.
8÷2
4
______
= __
5
10 ÷ 2
Use fraction strips or models to subtract. Simplify if possible.
5
2=
1. __
− __
5
5
3
7 − ___
2. ___
=
3
2=
3. __
− __
8
5
4. ___
− ___
=
6
3
5. __
− __
=
11 − ___
7 =
6. ___
5
2=
7. __
− __
4 − __
2=
8. __
8
11 − ___
9. ___
=
5
7 − ___
10. ___
=
6
4 =
11. ___
− ___
10
6
10
10
6
12
6
8
12
10
10
6
4
12
8
12
10
4
12
12
9
6
12. ___
− ___
=
12
12
13. Algebra Find x.
1 = __
1
x − __
6
6
R 12•3
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