**A resource to help reinforce place value and writing 3-digit numbers in expanded form. **

Use this resource when teaching students that numbers can be created in a variety of ways and how to write 3-digit numbers in expanded form.

**How To Use This Resource:**

- Print out a sheet of expanders for each student. Have them cut out each expander.
- On one expander, write a 3-digit number placing each digit in a white box.
- Starting with the first white box, fold the two gray boxes behind it, accordion style. You should now have the first two white boxes side by side.
- Repeat this process for each set of gray boxes. When you are finished, you should only be able to see the white boxes forming your 3-digit number.

This resource allows students to see some of the different combinations that make your 3-digit number. For example, if your number is 982, by revealing different gray boxes you can see that it equals:

- 982 ones
- 98 tens and 2 ones
- 9 hundreds and 82 ones
- 9 hundreds 8 tens and 2 ones

Allow students to use base-10 blocks to model each combination. This resource works well when teaching students this concept in guided math groups.

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