# Lesson 6 Compare Methods for Subtraction

• Let’s compare subtraction methods.

## Warm-up True or False: How many Tens? How many Ones?

Decide if each statement is true or false. Be prepared to explain your reasoning.

## Activity 1 Different Ways to Decompose

Diego and Elena drew base-ten diagrams to find the value of .

Diego

Elena

## Problem 1

Compare Diego’s work to Elena’s.

1. What is the same?

2. What is different?

## Problem 2

Tyler used equations to show his thinking.

Diego says Tyler’s work matches his diagram.
Elena says Tyler’s work matches her diagram.

Who do you agree with? Explain.

## Activity 2 Introduce Target Numbers: Subtract Tens or Ones

We are going to learn a new way to play Target Numbers. You and your partner will start with 99 and race to see who can get closest to 0.

## Problem 1

Here is Mai’s work with a subtraction expression.

1. What subtraction expression does Mai’s diagram show?

2. What is the value of the expression?

3. Use Mai’s method to find the value of .