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breaking apart

mental math method used to rewrite a number as the sum of numbers to form an easier problems

compensation

adding and subtracting the same number to make the sum or difference

counting on

counting up from the smaller number to find the difference of two numbers

associative property of addition

When the grouping of terms changes, the sum stays the same.

commutative property of addition

If the order of the terms changes, the sum stays the same.

Identity Property of Addition

The sum of 0 and any number is that number.

inverse operations

operations that undo each other