## CHAPTER 2: NUMERATION

**Lesson 7: Estimating Quantities**

**Goal**

Use amounts you know to estimate other amounts.

**Instructions for Use**

Estimator has students estimate quantities using referents.

Change the Problem Type to "Counting." Read the question above the Problem Type. Think about an appropriate referent to use for your estimation. Use your referent to estimate the quantity asked for, then enter your estimate in the box to the right of the question and click "Check Answer." If your answer is incorrect, adjust it. Click "Next Problem" when you've got it right.

If you need help, you can click "Hint" to make a grid appear. For extra challenge, you can change the Difficulty to Level 2.