Lesson 9 Expressions and Equations

    • Let’s show numbers 11–19 in different ways.

Warm-up Choral Count: Recording to 19

What patterns do you see?

Activity 1 Organize Expressions and Numbers

Work with your group to organize the cards in a way that makes sense to you.

Activity 2 Equations and 10-frames

Draw a line from each equation to the dots it matches.

  1. Ten frame, full. 4 counters below.
  2. Ten frame full. One counter below.
  3. Ten frame, full. 2 counters below.
  4. Ten frame full. 9 counters below.
  5. Ten frame, full. 8 counters below.
  6. Ten frame, full. 5 counters below.

Activity 3 Introduce Make or Break Apart Numbers, Numbers 11–19

Choose a center.


Center. Bingo.

Number Race

Center. Number Race.

Grab and Count

Make or Break Apart Numbers

Center activity. Make or break apart numbers.

Tower Build

Center activity. Tower Build.

Practice Problem

Problem 1

Choose an expression that matches the dots.

Ten frame, full. Below, 7 counters.

Explain how the expression matches the dots.