# Lesson 14 Make Sense of Decimal Subtraction

• Let’s subtract decimals.

## Warm-up True or False: Decimal Differences

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

## Activity 1 The Difference

1. Find the value of . Explain or show your reasoning.

2. What questions do you have about subtracting decimals?

## Activity 2 Introduce Target Numbers: Subtract Tenths or Hundredths

Directions:

1. Play one round of Target Numbers.

• Partner A:

• Start at 2. Roll the number cube. Choose whether to subtract that number of tenths or hundredths from your starting number.

• Write an equation to represent the difference.

• Take turns until you’ve played 6 rounds.

• Each round, the difference from the previous equations becomes the starting number in the new equation.

• The partner to get a difference closest to 1 without going under wins.

2. Describe a move that you could have made differently to change the outcome of the game.

## Problem 1

1. Which whole number is closest to? Explain or show your reasoning.

2. Find the value of .