# Surf for More Math

## CHAPTER 2: NUMERATION

**Lesson 7: Estimating Quantities**

Use these interactive activities to encourage students to have fun on the Web while learning about estimating quantities. Students can try these activities on their own or in pairs.

**Goal**

Use amounts you know to estimate other amounts.

**Builds Upon**

Student Book pages 42–43

**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.

Estimating Shapes - Rectangles (SMART Notebook-Compatible) asks students to estimate how many smaller rectangles will fit into a larger one and then check their guesses. Pages 4 to 7 are the most appropriate for this lesson. You should set this activity up for students. You may want to adapt the SMART Notebook file to suit your class.

Estimate how many small rectangles will fit into the larger rectangle. Write your estimate in the box. To check your estimate, drag small rectangles into the larger rectangle until you’ve filled it. Count the number of small rectangles in the larger rectangle and enter the number in the second box.

Estimating Shapes - Squares (SMART Notebook-Compatible) asks students to estimate how many smaller squares will fit into a larger one and then check their guesses. Pages 4 to 7 are the most appropriate for this lesson. You should set this activity up for students. You may want to adapt the SMART Notebook file to suit your class.

Estimate how many small squares will fit into the larger square. Write your estimate in the box. To check your estimate, drag small squares into the larger square until you’ve filled it. Count the number of small squares in the larger square and enter the number in the second box.