Basic students round to the nearest 10;
Number and Operations-Base Ten
Use place value understanding and properties of arithmetic to perform multi-digit arithmetic.
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Describe, explore, and explain how the counting numbers 11 to 19 is:
Basic students recognize that a digit in the tens place is a multiple of 10;
Basic students recognize that in a multi-digit number, a digit in the ones place represents 10 times as much as it represents in the place to its right;
Composed of ten ones and more ones.
Decomposed into ten ones and more ones.