addition

Definitions

(Noun) to add to, to increase in number,

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(Noun) A form of basic arithmetic in which two or more numbers are combined to find the total

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(Noun) something extra or more; adding numbers

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(Noun) putting two numbers together to make one bigger number

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(Noun) Adding stuff to get a sum or answer [2+2=4 (sum)]

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(Noun) In math, when two or more numbers are taken and combined to create the sum, or answer, to an addition problem.

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(Noun) you add 6+6 =12 that is what an addition problem is.
for ex. 15=15=30 that is the ex.