Mathematics 1

# Surf for More Math

## Lesson 4 - 100 Robos

To encourage students to have fun on the Web while learning about 100 Robos, here are some games and interactive activities they can do on their own or in pairs.

### Goal

Combine multiples of 10 to form 100.

### Instructions for Use

Interactive 100 Square lets students represent numbers that are multiples of 10.

To use Interactive 100 Square, click on the "Start with 1" button. Input 10 in the first text box, and click the red square.

Interactive Number Grid lets students find multiples of 10 to 100 on the chart.

To use Interactive Number Grid, click on the grid. Numbers are highlighted in yellow. Click the first up arrow to increase the start number on the grid by 1, and click on the down arrow to decrease the start number by 1. Click on the second up arrow to increase the number of columns on the grid, and click on the down arrow to decrease the number of columns on the grid. Click on the third box to show multiples, and adjust the base using the up and down arrows. Click the "Reset" button to start again. Click on the mask button and a small grid pops up. Click in the boxes of the small grid to obscure numbers on the larger grid. Move the mask around the grid by using the pointer arrows.