add - to join together sets to find the total or sum, plus - the symbol used to show addition, true - something that is real, opposite of false, false - something that is not true, part - one of the two parts joined to make a whole, equals - the sign used to show the same value or is the same as, whole - sum of two parts, sum - answer to an addition problem, addition number sentence - an expression using numbers and the + and = sign, addend - a number added to another number,

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