# Lesson 6 Make a Ten and Make Sense of Equations

• Let’s add one-digit and two-digit numbers and make sense of equations.

## Warm-up Number Talk: Add Within 20

Find the value of each expression mentally.

## Problem 1

Find the number that makes each equation true.
Be ready to explain your thinking in a way that others will understand.

## Problem 2

What did you notice about the unknown number in each equation?

## Activity 2 Elena and Andre Add

Elena and Andre found the value of .

1. Elena started with .
What does Elena need to do next?
Show your thinking using drawings, numbers, or words.

2. Andre started with .
What does Andre need to do next?
Show your thinking with drawings, numbers, or words.

3. Find the value of . Show your thinking using drawings, numbers, or words.

## Activity 3 Introduce Target Numbers: Add Ones

We are going to learn a new center called Target Numbers. Let’s play a round together. First, mix up your number cards.

## Problem 1

Find the value of each sum.
Show your thinking using drawings, numbers, or words.