Lesson 4 Build Fractions from Unit Fractions
Let’s build other fractions from unit fractions.
Warmup 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.
Make two stacks: one for secret fractions and one for unit fractions. Place all cards face down.
Each player draws 2 secret fraction cards. These are the fractions you are trying to make with your unit fractions.

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.
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.
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.
A student walks
the length of the street and hides a rock. A student walks
the length of the street and hides a penny. A student walks
the length of the street and hides a stick. A student walks
the length of the street and hides a penny. 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.
Practice Problem
Problem 1
Jada walks across the street at a stoplight