Associative Propetry of Addition - You can group two addends in any way and the sum will be the same., Commutative Property of Addition - You can add the numbers in any order and the sum will be the same., Identity (Zero) Property of Addition - The sum of zero and any number is the same number., Sum - The answer to an addition problem., Addend - Numbers added together to give a sum, Open Number Line - A number line which only displays the numbers being computed., Inverse Operation - Two operations that undo each other., Place Value - The value given to the place a digit has in a number., Round - To replace a number with a number that tells about how much or how many to the nearest ten, hundred, thousand, and so on., Compatible Numbers - Numbers that are easy to add, subtract, multiply, or divide mentally., Difference - The answer to a subtraction problem.,

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