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Finding the sum or total of two numbers Addition Finding the difference between two numbers Subtraction The answer to an addition problem Sum The answer to a subtraction problem Difference Estimation Identity property Commutative property Rounding the addends, or subtrahend and minuend to find an approximate answer Any number added to 0 stays the same The addends can be switched or flipped and it doesn’t change the sum Opposite operations – addition is the opposite of subtraction Inverse The total number of objects Minuend The number being subtracted or taken out Subtrahend Related number facts All the true number sentences that can be created using the same three numbers Reorganizing numbers so they can be subtracted or added Regroup Number sentence Addend A number sentence are the numbers that are connected by operations and their equivalent part Addends are the two numbers that are added together