Lesson Plan

Adding Within 20

This scaffolded EL lesson will help your students fluently add within 20, while reinforcing parts of a whole. Use as a pre-lesson for Addition: Over in a Flash, or as a stand alone activity.
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This lesson can be used as a pre-lesson for the Addition: Over in a Flash lesson plan.
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This lesson can be used as a pre-lesson for the Addition: Over in a Flash lesson plan.

Objectives

Academic

Students will be able to fluently add within 20.

Language

Students will be able to explain how to find two addends that equal a given sum with more complex sentences using partnerships and sentence frames for support.

Introduction

(3 minutes)
Part Part WholeVocabulary Cards: Adding Within 20Glossary: Adding Within 20Teach Background Knowledge TemplateWrite Student-Facing Language Objectives Reference
  • Bring the students together in a comfortable space and pass out personal whiteboards and markers to each student.
  • Write a number on the whiteboard within 20 (e.g. 10, 15, 12, etc). Explain to the students that this number represents a whole amount of banana muffins. Ask the students to think-pair-share with an elbow partner about how they could split the whole amount of muffins into two parts. Give students a few minutes to think of their ideas and instruct them to jot them down on their whiteboards.
  • Allow a few students to share out their ideas. Ideas may include: 10 and 10, 13 and 7, 12 and 8, etc.
  • Explain to the students that the two parts are called addends in addition, which simply means the numbers being added together.
  • Point to the number 20 and explain to the students that 20 is the sum, or the total amount. When we add both addends together, we get the sum.
  • Explain that today they will explain how to find two addends that equal a given sum.