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Elementary arithmetic

  • DecimalTen fingers on two hands likely sparked the first human counting systems. Ancient Egyptian hieroglyphs from around 3000 BCE used a purely decimal system to…
  • 0Adding zero to any number leaves that number unchanged. This property makes zero the additive identity of integers, rational numbers, real numbers, and…
  • Equality (mathematics)In 1557, Welsh mathematician Robert Recorde published The Whetstone of Witte. This book introduced the equals sign to the world for the first time.