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AdditionAddition is a method of rapid or fast countingAddition is putting two or more parts together to make a whole.Parts are called addendsWholes are called sumsAddition has the Communitive Property (the order in which the numbers are added does not make a difference (5+4=9 is the same as 4+5=9)Addition has an Identity Property ( Add zero to any number the number does not change (7+0=7)Place value is important only numbers with the same place value can be added