Lesson 10

Complete Equations

Lesson Purpose

The purpose of this lesson is for students to represent numbers 11–19 with equations.

Lesson Narrative

In previous lessons students composed and decomposed numbers 11–19 with 10 ones and some more ones. They saw numbers 11–19 represented with written numbers, phrases such as “10 and 2,” expressions, and equations. In this lesson, students interpret equations and fill in the missing numbers to complete equations for numbers 11–19 (MP2).

  • Action and Expression
  • MLR8

Learning Goals

Teacher Facing

  • Represent numbers 11–19 with equations.

Student Facing

  • Let’s write equations to show numbers 11–19.

Required Materials

Required Preparation

Activity 3:

  • Gather materials from:
    • Make or Break Apart Numbers, Stages 1 and 2
    • Bingo, Stages 1-4
    • Number Race, Stages 1 and 2
    • Grab and Count, Stage 1
    • Tower Build, Stages 1 and 2

CCSS Standards


Lesson Timeline

Warm-up 10 min
Activity 1 10 min
Activity 2 10 min
Activity 3 20 min
Lesson Synthesis 10 min
Cool-down 0 min

Teacher Reflection Questions

What opportunities are you giving students to reflect on their understanding of the mathematical content?

Print Formatted Materials

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Student Task Statements pdf docx
Lesson Cover Page pdf docx
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Teacher Presentation Materials pdf docx

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