Abstract place value reasoning with whole numbers to decimal numbers.
Number and Quantity
Number & Operations in Base Ten: Understand the place value system.
Reason abstractly and quantitatively.
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Abstract 10 ones into a single conceptual object called a ten.
Compose and decompose numbers 11–19 to gain foundations for place value using objects and drawings.
100 can be thought of as a bundle of ten tens — called a “hundred.”
The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones.
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).