# What are Addends Used as in Number Sentences?

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A number sentence is any addition, subtraction, multiplication or division problem -- complete with the factors that are being computed -- as well as the answer to the problem. The different parts of a number sentence are distinguished by the particular names assigned to them. In addition sentences, the factors being added are called addends, and the answer is called the sum.

• The factors of an addition sentence that are being added together are called the addends, and will be separated by a plus (+) sign. There can be any number of addends in an addition sentence. In the generic addition sentence a + b + c = d, "a", "b" and "c" are the addends.

## The Sum

• The sum is the solution to an addition sentence, or the answer computed when all addends are added. For a + b + c = d, "d" is the sum. There can only be one sum to any particular addition sentence, and it always follows the equals sign.

• In addition sentences with a missing addend, the addend can be solved for algebraically by isolating the variable and using the reverse operation, subtraction. For example, in the number sentence, 12 + x = 29, the missing addend "x" can be solved for by the subtraction sentence 29 - 12 = x, which equals 17.

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