Mathematics 1

# Surf for More Math

## Lesson 7 - How Many Tens and Ones?

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

### Goals

Estimate quantity and group 10s and 1s to check.

Model numbers grouped in 10s and 1s.

### Instructions for Use

Bongo Blocks prompts students to model numbers using tens and ones blocks.

To use Bongo Blocks, click on the ones, tens or hundreds buttons to the left of the screen to make a number appear. Have students drag and drop the correct number of blocks.

Base Block Addition lets students practice adding numbers using tens and ones blocks.

To use Base Block Addition, drag a base block into a column to the left. If students move a block one column to the right, it breaks apart to show the exchange, for example, a 10-long for ten units. To group pieces to exchange the other direction, click and hold the mouse key down while dragging a rectangle to 'lasso' the pieces. The newly grouped object can then be dragged into the next column.

To complete a preset addition problem, select base 10 and click on the "Next Problem" button. Group any pieces and drag them into the next column. Start with the 1s column and work to the 10s column. The addition solution will appear on the left.

To add the blocks together to create your own problem, click on the "Create Problem" button and then use the blue buttons at the top to enter blocks above and below the dashed line. As long as there are two numbers correctly represented in the specified base, the addition problem will appear on the left. To solve it, click on the "Begin Problem" button and then on any of the blocks in the workspace.