Why You Can't Bring Checkerboards to Math Exams

A chessboard and a set of counters makes a formidable calculation device. This is from the final part of John Napier's treatise called Rabdologia, or Rabdology. He called it 'Location Arithmetic as Performed on a Chessboard'. This method of using counters on a chessboard is based on binary and basic algebraic properties, and with only sliding counters on a chessboard we can perform multiplication, division, and square roots, even square roots of irrationals. #maths #mathtricks #mathematics I just launched a math fashion brand at https://mathshion.com/ Check it out and pick up some of the coolest math merch of all time! Join Wrath of Math to get exclusive videos, lecture notes, and more:    / @wrathofmath   Sources: Gamma: Exploring Euler's Constant by Julian Havil https://old.maa.org/press/periodicals...    • Chessboard Abacus - Division   Outro music available for channel members. 0:00 Intro 1:17 Multiplication 5:33 Division 11:33 Square Roots 17:59 Square Root of 2 20:48 Conclusion