Lesson 13

Formemos 10

Lesson Purpose

The purpose of this lesson is for students to find the number that makes 10 when added to a given number.

Lesson Narrative

In previous lessons, students used 10-frames and fingers to compose and decompose 10 in more than one way. In the previous lesson, students used the structure of a partially filled in 10-frame to determine how many more needed to be added to make 10. In this lesson, students develop strategies for finding the number that makes 10 when added to a given number.

While students may use any method that makes sense to them to find the given number, using 10-frames and fingers is highlighted because the structure allows students to see how many more are needed to make 10. As they choose a strategy, they will be making use of appropriate tools strategically (MP5).

  • Engagement
  • MLR8

Learning Goals

Teacher Facing

  • Fill in equations to represent compositions and decompositions of 10.
  • Find the number that makes 10 when added to a given number.

Student Facing

  • Formemos 10.

Required Materials

Materials to Gather

Materials to Copy

  • 10-Frame Standard
  • Number Mat 1–9
  • Math Fingers Stage 4 Recording Sheet

Required Preparation

Activity 3:

  • Gather materials from: 
    • Math Fingers, Stages 1-4
    • Shake and Spill, Stages 1-3
    • Counting Collections, Stage 1
    • Roll and Add, Stages 1 and 2

CCSS Standards


Building Towards

Lesson Timeline

Warm-up 10 min
Activity 1 10 min
Activity 2 15 min
Activity 3 15 min
Lesson Synthesis 5 min
Cool-down 5 min

Teacher Reflection Questions

What connections did students make between the different strategies shared? What questions did you ask to help make the connections more visible?

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
Blackline Masters zip