teaching resource

Numeral Expander for 3-Digit Numbers

PDF | 1 page | Grades: 1 - 2

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.