Example image of eyePlorer eyePlorer map for 'Addition': Mathematics Plus and minus signs Euclidean vector Fraction Irrational number Negative and non-negative numbers Operation (mathematics) Associativity Commutativity Summation 0 (number) 1 (number) Counting Multiplication Subtraction Addition of natural numbers Mathematical proof Real number Abstract algebra Binary operation Decimal Primary education Abacus Computer Infix notation Equals sign Underline Fraction (mathematics) Renaissance Latin Compound (linguistics) English language Proto-Indo-European root Verb Affix Gerundive Noun Anicius Manlius Severinus Boethius Sextus Julius Frontinus Vitruvius Geoffrey Chaucer Middle English Natural number Rigour Pie Order of operations Additive identity Identity element Brahmagupta Brahmasphutasiddhanta