## 2.G.A.3

## Partition circles and rectangles into two, three, or four equal shares, describe the shares using the words halves, thirds, half of, a third of, etc., and describe the whole as two halves, three thirds, four fourths. Recognize that equal shares of identical wholes need not have the same shape.

17 Lesson(s)

#### Students learn the vocabulary halves, thirds, fourths, fifths, and sixths and then work to divide circles into equal pieces.

Big Idea:

#### We are all called by more than one name. Lets find out if fractions can be too!

#### Students recognize what it means to fold a paper in half, but do they recognize how to create fourths or thirds?

#### Students explore how to break a square into equal parts. This is the first lesson in a series of lessons that preview fractions for 3rd grade.

Big Idea:

#### Students review the skills necessary to partition rectangles.

#### Students learn about equal shapes and then explore dividing squares to make equal triangles.

#### What better way to see a practical use of fractions than by measuring, mixing and eating the results.

#### Students build upon their knowledge of partitioning circles and rectangles to discuss and explore what happens when one or more sections of the whole are taken away.

#### A whole can be cut into a variety of different parts. Those parts may identify the same portion of the whole.

#### Fractions are numbers and seeing them as a part of a whole and a length helps conceptual understanding of what a fraction is.

#### Students always think of unit fractions (1/2, 1/3, 1/4), but the numerator can change. What happens when it changes? What does that mean for how much of the whole I have?

#### Can you double an odd number? Can you cut it in half? Patterns in doubles and halves help to answer these questions.

Big Idea: