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Addition - Wikipedia ... Addition
This article will use the Peano axioms for the definition of natural numbers. With these axioms, addition is defined from the constant 0 and the successor function S (a) by the two rules. For the proof of commutativity, it is useful to give the name "1" to the successor of 0; that is, 1 = S (0). For every natural number a, one has.
History of mathematics
Helping children learn the basic facts is an important goal in the Everyday Mathematics Curriculum. Most children should have developed an automatic recall of the basic addition and subtraction facts by the end of the second grade. They should also know most of their 1, 2, 5, and 10 multiplication facts by this time.
Mathematics - Wikipedia ... Mathematics
Mathematical proof
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