## CHAPTER 3: ADDING AND SUBTRACTING DECIMALS

**Lesson 2: Communicating about Estimating and Calculating **

**Goal**

Explain clearly how to estimate and calculate.

**Instructions for Use**

**Decimal Darts**

You will be shown a dart board with three balloons. The top of the dartboard is represented by one number and the bottom is represented by another number. You must type a number that you think will hit a balloon and then throw a dart. You may want to visualize a number line running along the length of the dartboard to help you. After each game, explain to your partner why you chose the numbers you did.