Lesson 9

Suma con una decena

Lesson Purpose

The purpose of this lesson is for students to deepen their understanding that teen numbers are composed of a ten and some ones, and to find the value that makes an addition equation true when one addend is 10.

Lesson Narrative

This lesson builds on the previous lesson in which students composed teen numbers using a ten and some ones. Students move from using connecting cube towers to filled-in 10-frames to represent teen numbers. Students also relate their composition work and the relationship between addition and subtraction to find values that make equations true.

Students continue using double 10-frames throughout the unit. Consider making copies on card stock so they can be used repeatedly.

  • Representation
  • MLR8

Learning Goals

Teacher Facing

  • Compose and decompose teen numbers into 1 ten and some number of ones.
  • Find the value that makes an addition equation true, where one addend is 10.

Student Facing

  • Usemos una decena para formar números del 11 al 19.

Required Materials

Materials to Gather

Materials to Copy

  • Number Cards 11-20
  • Double 10-Frame - Standard

Required Preparation

Activity 1:

  • Create a set of Number Cards (11-20)  from the blackline master for each group of 2.

CCSS Standards

Lesson Timeline

Warm-up 10 min
Activity 1 20 min
Activity 2 15 min
Lesson Synthesis 10 min
Cool-down 5 min

Teacher Reflection Questions

What methods are students using when they build teen numbers: concrete objects on a 10-frame, drawings, numbers? How do these methods reflect their developing understanding of the unit ten?

Print Formatted Materials

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Student Task Statements pdf docx
Lesson Cover Page pdf docx
Cool Down Log In
Teacher Guide Log In
Teacher Presentation Materials pdf docx
Blackline Masters zip