# Circles in a Cup

Help students visualize the missing addend in an addition problem with this fun game. Use this scaffolded EL lesson alone or for more practice before teaching the **Mystery Addends: Representing Word Problems** lesson.
This lesson can be used as a pre-lesson for the Mystery Addends: Representing Word Problems lesson plan.
##### View aligned standards
This lesson can be used as a pre-lesson for the Mystery Addends: Representing Word Problems lesson plan.

#### Objectives

Students will be able to identify an unknown addend in an addition problem.

##### Language

Students will be able to describe strategies to determine an unknown addend in an addition number sentence using manipulatives and partner support.

#### Introduction

(5 minutes)
• Tell students the story problem, "I love bird watching! The other day I saw ten birds in my yard. Four birds were sitting in a tree, and the rest were flying around. How many birds did I see flying around?"
• Tell students to turn and talk to a partner to describe what is known in the story problem. Choose students to describe what is known: 1) There were ten birds total and 2) Four were sitting in a tree.
• Choose students to describe different approaches to understand and solve the problem. Some students may approach the problem as an addition problem with an unknown addend. Others may subtract to solve. Validate student thinking and strategies.
• Sketch the sceanario, first drawing a tree with four birds. Count on to ten as you draw the birds not on the tree, "Five, six, seven, eight, nine, ten." Point to each one as you model solving the problem. Think aloud, "Yes, the picture shows that six birds were flying around."
• Reflect, "I know that four plus six equals ten, and that ten minus four equals six." Write the two equations under the picture.