Common Core Sheets 

Number and Operations in Base Ten 
Understand place value. 
2. Understand that the two digits of a twodigit number represent amounts of tens and ones. Understand the following as special cases: 
b. The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones. 
Example (Hover to Enlarge) 
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Breaking Apart Tens and Ones 1nbt2b
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Each worksheet has 18 problems breaking apart a two digit number into tens and ones.
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