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Ken Wilshire Coulsdon 6 th Form College

Ken Wilshire Coulsdon 6 th Form College. kenwilshire@gmail.com MathsJam November 12/13 2011. Early Maths Puzzle Background. Maths puzzle book ( age six) Man and Dog waiting at zebra crossing D og calculating speed of approaching car

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Ken Wilshire Coulsdon 6 th Form College

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  1. Ken WilshireCoulsdon 6th Form College kenwilshire@gmail.com MathsJam November 12/13 2011

  2. Early Maths Puzzle Background • Maths puzzle book (age six) • Man and Dog waiting at zebra crossing • Dog calculating speed of approaching car • Bubble thought box with annotated right angled triangle • Henry Ernest Dudeney (Puzzles and Curious Problems) • Sam Loyd’s contemporary • Games and Puzzles magazine (1972 - 1981) • Including David Singmaster’s Column

  3. World Tournaments of the Mind • World Memory Championships – 1991 to date • Mind Sports Olympiad – 1997 to date • World Puzzle Championships – 1990 to date (UK 2000+) • Incorporating World Sudoku Championships – from 2006 • Mental Calculations World Cup – 2004 to date (biannual) • Memoriad – 2008 to date (quadrennial) • Combines Memory and Mental Calculations

  4. Mental Calculations World Cup • Organiser: Ralf Laue - Germany • Four “Standard” Sections : • Calendar calculations • Multiplication • Addition • Division • Surprise tasks (were two – now six) • Equal weighting from 2012 • Reigning Champion – Priyasnshi Somani (India) aged 11 years • First (and Second) Champion – Robert Fountain (UK)

  5. Calendar Calculations • 1 minute • Record – now 93 dates !!!

  6. Multiplication • 10 = 8 x 8 in 10 minutes Record – 4 min 29 sec

  7. Addition • Adding 10 x 10 digits in 10 minutes • Record 3 min 19 sec

  8. Division • 10 sq rt of 6 digit numbers to 8 sig figures in 10 min • Record 6 min 19 sec

  9. Surprise Tasks • Six problems presented immediately before solving

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