# Lesson 4 Build Fractions from Unit Fractions

• Let’s build other fractions from unit fractions.

## Warm-up Number Talk: 3 and Another Factor

Find the value of each expression mentally.

## Activity 1 Introduce Secret Fractions

The goal of the game is to be the first to build 2 secret fractions with unit fractions.

1. Make two stacks: one for secret fractions and one for unit fractions. Place all cards face down.

2. Each player draws 2 secret fraction cards. These are the fractions you are trying to make with your unit fractions.

3. On your turn, you can make one of these moves:

• Pick up 1 unit fraction card.

• Trade both of your secret fractions for 2 new secret fractions from the stack.

4. When you have enough unit fractions to make one of your secret fractions, shade your gameboard to represent your secret fraction. Then, pick a new secret fraction.

5. The first player to make 2 secret fractions wins.

## Activity 2 Represent Fraction Situations

Here are four situations about playing Pilolo and four diagrams. Each diagram represents the length of a street where the game is played.

Represent each situation on a diagram. Be prepared to explain your reasoning.

1. A student walks the length of the street and hides a rock.

2. A student walks the length of the street and hides a penny.

3. A student walks the length of the street and hides a stick.

4. A student walks the length of the street and hides a penny.

5. This diagram represents the location of a hidden stick.

About what fraction of the length of the street did the student walk to hide it? Be prepared to explain how you know.

## Problem 1

Jada walks across the street at a stoplight of her way from home to school. Represent the situation on the fraction strip. Explain your reasoning.