# Surf for More Math

## CHAPTER 8: ADDITION AND SUBTRACTION

**Lesson 4: Adding on a 100 Chart **

Use these interactive activities to encourage students to have fun on the Web while learning about adding and subtracting two-digit numbers. Students can try these activities on their own or in pairs.

**Goal**

Use a 100 chart as a visual tool for adding two-digit numbers.

[C, CN, ME, R, V]

**Instructions for Use**

**Interactive Calculator** allows students to add two-digit numbers and display them on a 100 chart.

To use Interactive Calculator, start by clicking a two-digit number on the interactive calculator. This number will appear in the calculator window. Click the + button on the calculator, and then click a different two-digit number. Press the = button on the calculator to find the sum of the two numbers.