## Lesson: Addition and Subtraction of Fractions

Developing the Concept

Once students have practiced addition and subtraction of fractions with like denominators concretely, they can move to a semi-concrete level by drawing their own pictures representing addition and subtraction of fractions. This will allow for an easier transition to abstract operations on fractions in the near future.

**Materials**: ruler, an old CD-ROM or other round object to trace, a rectangular object, colored pencils or crayons, and paper, overhead projector, or board for teacher demonstration

**Preparation**: Students can be placed in groups of 2−4 students. Each group needs an old CD-ROM and colored pencils or crayons. Each student needs paper and a ruler.

**Wrap-Up and Assessment Hints**

After students have worked with manipulatives to add and subtract fractions with like denominators and have drawn pictorial representations, assess student understanding by providing them with several addition and subtraction exercises in written format, such as + = . Allow students to use manipulatives to solve exercises.