Welcome to the Mathematical World!

Robert Recorde (1512 – 1558)

Mathematics Educator and Inventor of the Equals Sign

Robert Recorde is remembered for making mathematics accessible in English and for introducing the equals sign (=), which is universally used today. In his textbooks, including The Grounde of Artes, he explained arithmetic, algebra, and geometry in clear, practical language aimed at students, merchants, and aspiring mathematicians.

By standardizing notation and providing instructional clarity, Recorde helped spread mathematical literacy across England and beyond. For instance, he wrote equations such as: \[ x + 2 = 5 \quad \Rightarrow \quad x = 3, \] introducing the equals sign to signify balance between expressions clearly.

Recorde’s approach combined theoretical concepts with real-world applications, showing that abstract reasoning could be taught and used effectively. He contributed to algebraic methods, developing notation and examples that simplified the manipulation of equations, making mathematics approachable for English speakers.

Despite dying in debtors’ prison, Recorde’s legacy survives through the symbols and techniques—especially the equals sign—that remain central to mathematics education and everyday problem-solving today.

Facts:

• Born in Wales.
• Wrote The Grounde of Artes, one of the first English mathematics textbooks.
• Introduced the equals sign (=) in 1557.
• Served as a physician as well as a mathematician.
• Made algebra accessible to English-speaking learners.