# Numeral Expander for 3-Digit Numbers

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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.

#### Common Core Curriculum alignment

• CCSS.MATH.CONTENT.1.NBT.B.2

Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases:

• CCSS.MATH.CONTENT.1.NBT.B.2.A

10 can be thought of as a bundle of ten ones — called a "ten."

• CCSS.MATH.CONTENT.1.NBT.B.2.B

The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones.

• CCSS.MATH.CONTENT.1.NBT.B.2.C

The numbers 10, 20, 30, 40, 50, 60, 70, 80, 90 refer to one, two, three, four, five, six, seven, eight, or nine tens (and 0 ones).

• CCSS.MATH.CONTENT.2.NBT.A.1

Understand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones; e.g., 706 equals 7 hundreds, 0 tens, and 6 ones. Understand the following as special cases:

• CCSS.MATH.CONTENT.2.NBT.A.1.A

100 can be thought of as a bundle of ten tens — called a "hundred."

• CCSS.MATH.CONTENT.2.NBT.A.1.B

The numbers 100, 200, 300, 400, 500, 600, 700, 800, 900 refer to one, two, three, four, five, six, seven, eight, or nine hundreds (and 0 tens and 0 ones).

• CCSS.MATH.CONTENT.2.NBT.A.3

Read and write numbers to 1000 using base-ten numerals, number names, and expanded form. #### Find more resources for these topics

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