# Lesson 19 Methods for Addition Within 20

Let’s add within 20.

## Warm-up Number Talk: Related Expressions

Find the value of each expression mentally.

## Activity 1 Lin, Han, and Kiran Add

Lin, Han, and Kiran are finding the value of

Lin thinks about

Han thinks about

Kiran thinks about

Explain how each student’s method works.

Show your thinking using drawings, numbers, or words.

## Activity 2 How Did You Add?

Choose an addition card.

Each partner finds the value independently.

Each partner gives a signal when they are ready to explain their thinking.

Each partner shares their thinking.

Each partner writes the equation.

Choose your favorite equation.

Show how you found the value using drawings, numbers, or words.

## Practice Problem

## Problem 1

Find the value of each sum.

Show your thinking using drawings, numbers, or words.