# Surf for More Math

## CHAPTER 2: NUMBER TO 50

**Lesson 9: Counting on a Number Line**

Use these interactive activities to encourage students to have fun on the Web while learning about the numbers to 50. Students can try these activities on their own or in pairs.

**Goal**

Use a number line to skip count by 2s, 5s, and 10s, and to count backward.

[C, R, V]

**Instructions for Use**

**Number Line Counting** lets students visualize adding or subtracting numbers on a number line.

To use Number Line Counting, select the "-" button at the bottom of the screen. Click the "Go" button under the mathematical problem. Animated arcs represent the problem. Click the "New Problem" button and a new problem will be displayed. To show an addition problem on the number line, select the "+" button at the bottom of the screen.

**Number Line Express** lets students count forward and backward on a number line.

To use Number Line Express, read the lion's instructions. Then drag the pointer to the point on the number line where the instructions take you. Click the "GO" button.