# Decomposing Numbers – Matchup Activity

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Free on Plus | 12 pages (PDF)|Grades: 1 - 2

A set of decomposing number cards to create number sentences when grouping in tens and ones.

Use this teaching resource to help students understand the decomposing of numbers and the importance of grouping in tens and ones.

Students decompose a range of two-digit numbers by connecting them with their corresponding ‘tens’ and ‘ones’ cards. You may want to have your students use Base-10 blocks to create the number first before finding the matching number cards. Then connect to expanded form by having your students use the addition and equal sign cards to make a number sentence.

This activity is great to use as a math center activity during your place value unit.

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#### Common Core Curriculum alignment

• CCSS.MATH.CONTENT.1.NBT.A.1

Count to 120, starting at any number less than 120. In this range, read and write numerals and represent a number of objects with a written numeral.

• 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.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.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.3

Read and write numbers to 1000 using base-ten numerals, number names, and expanded form.

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