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: 
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). 
Example (Hover to Enlarge) 
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Writing With Tens and Ones 1nbt2c
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Each worksheet has 15 problems writing a number based on the tens and ones.
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Counting Groups of Ten 1nbt2c
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Each worksheet has 8 problems counting the groups of ten and the total small blocks.
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Place value blocks (10s and 1s) 1nbt2c
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Each worksheet contains 12 problems identifying the value the place value blocks represents.
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