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mental math method used to rewrite a number as the sum of numbers to form an easier problems
adding and subtracting the same number to make the sum or difference
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.
operations that undo each other