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Number and Operations in Base Ten Understand place value. 2Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases: cThe 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).
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Writing With Tens and Ones
 - writing-with-tens-and-ones worksheet  - writing-with-tens-and-ones worksheet
Counting Groups of Ten
 - counting-groups-of-ten worksheet  - counting-groups-of-ten worksheet
Place value blocks (10s and 1s)
 - place-value-blocks-10s-and-1s worksheet  - place-value-blocks-10s-and-1s worksheet