M.1.10

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

M.1.10.a10 can be thought of as a bundle of ten ones — called a “ten.” (e.g., A group of ten pennies is equivalent to a dime.)M.1.10.bThe numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight or nine ones.M.1.10.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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