Numbers

## Number Concepts

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* Natural numbers elementary Positive counting numbers: 1, 2, 3, ...
* Counting
* Number line with positive numbers
* Numeration
* Decimal numeration
* Addition and subtraction of positive whole numbers
* Multiplication and division of positive whole numbers
* Exponents
* Expressions
* Order of operations
* Evaluating expressions
* Rounding and estimating
* Integers Positive and negative whole numbers and zero: ..., -3, -2, -1, 0, 1, 2, 3, ...
* Negative numbers
* Number line with negative numbers
* Addition of positive and negative whole numbers
* Subtraction of positive and negative whole numbers
* Multiplication and division of positive and negative whole numbers