# Surf for More Math

## Lesson 2 - Adding on a 100 Chart

Use these interactive activities to encourage students to have fun on the Web while learning about adding on a 100 chart. Students can try these activities on their own or in pairs.

### Goals

Use a 100 chart to add 2-digit numbers.

Add 10 to a 2-digit number.

### Instructions for Use

Counter Square lets students solve addition problems using a 100 chart.

To use Counter Square, click the "Make Counters" button to create multi-coloured counters. Drag and drop them onto the grid to show number patterns of the students' choice. Click "Ideas" for suggestions on how to use counters on the grid.

Interactive Calculator allows students to add 2-digit numbers and display them on a 100 chart.

To use Interactive Calculator, start by clicking a 2-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 2-digit number. Press the "=" button on the calculator to find the sum of the 2 numbers.