Also known as adding, collecting, summing, summation, plus
right|thumb|upright=0.5|alt=Diagram: One column containing three apples, and another column containing two apples; put together, there are 5 apples in total.|3 + 2 = 5 with apples, a popular choice in textbooks
Addition is the mathematical operation of combining two or more numbers or quantities to find their total. It matters because it's one of the most fundamental tools we use in everyday life, from counting objects to managing money and solving practical problems.
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).