## 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)

Big Idea:

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

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

#### 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.

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

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

#### 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.

#### 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.

#### People talk about quarters of the hour, or quarters in a dollar. This lesson lets students in on what that means.

Big Idea: