Mathematics 1

# Surf for More Math

## Lesson 7 - Representing 20

To encourage students to have fun on the Web while learning about Representing 20, here are some games and interactive activities they can do on their own or in pairs.

### Goal

Recognize 20 as 2 tens.

### Instructions for Use

Number of Objects lets students visualize that 20 is 2 tens.

To use Number of Objects, click the "Start" button. Have students select the button that represents the number of blocks in the group.

Ten Frame is an interactive tool that helps students practice counting and adding to twenty. The frames help students think of numbers in relation to 20.

To use Ten Frame select one of the 5 games to play from the pull-down games menu.

To play How Many?, count the number of dots, and input the answer in the text box.

To play Build a Frame, drag the number of dots unto the frame from the bank. Click the "Check Answer" button to see if the answer is correct.

To play Fill a Frame, count how many dots are needed to fill a frame. Input the answer in the text box, and click the "Check Answer" button to see if the answer is correct.

To play Add with Frames, drag the number of dots into each frame to answer the equation. Click the "Check Answer" button to see if the answer is correct. Combine the number of dots to answer the equation, and input the answer in the text box. Click the "Check Answer" button to see if the answer is correct.

To play Random, drag the number of dots unto the frame from the bank. Click the "Check Answer" button to see if the answer is correct.

Click the "New" button for a new question.

Base Ten Blocks allows students to visualize the 20 as 2 tens.

To use Base Ten Blocks, click the place value backdrop to tens. Click on a tens block and drag it into the workspace. Select the block by clicking on it. Once selected, the block can be moved to any location on the workspace. To remove a block, drag it to the recycling bin. Click on the tools on the top panel to select and drag, rotate, lasso blocks to group them, break larger blocks into the next size down, or glue smaller blocks to form the next size up.

Break the tens block into ones. Add a second tens block. Have students recognize that 20 is 2 tens.

Tens and Ones Mini-Lesson lets students watch an animation that breaks tens into ones.

To use Tens and Ones Mini-Lesson, watch the animation. Click the "Next" button to view a different number.

Tens and Ones Exercise lets students practice visualizing tens and ones.

To use Tens and Ones Exercise, have students enter the 2-digit number described by the graphic. Click the "Answer" to see if it is correct. Click the "Next" button for the next graphic.