# 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.

## Activity 1 How Many to the Next Ten?

## 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

Elena started with

.

What does Elena need to do next?

Show your thinking using drawings, numbers, or words.Andre started with

.

What does Andre need to do next?

Show your thinking with drawings, numbers, or words.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.

## Practice Problem

## Problem 1

Find the value of each sum.

Show your thinking using drawings, numbers, or words.