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About the Mental Calculation, Mathematics, and Puzzles category
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1
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1341
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October 27, 2018
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Jeonghee Lee on Russian Show. So impressive
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23
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573
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August 2, 2020
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Which multiplication technique do you use for 3 and 4 digit numbers and why?
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3
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131
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August 1, 2020
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Simple times tables help for a 30 year old
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17
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677
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July 30, 2020
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Mental Calculation Competitions in 2020 and 2021
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7
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459
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July 29, 2020
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Memoriad Additions: how to solve it quickly?
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13
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715
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July 28, 2020
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Find Antilogarithms using Table and Linear Interpolation
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1
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100
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July 26, 2020
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Shakuntala Devi, the Human Computer
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1
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120
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July 26, 2020
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How to memorize logical word problems
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4
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161
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July 22, 2020
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A Technique for Running Arbitrary Computations in One's Mind
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7
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1300
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July 21, 2020
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Amazing Rachel Riley
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2
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170
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July 20, 2020
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1985: Wim KLEIN against a computer
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1
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134
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July 20, 2020
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Teenagers mentally calculated 100 3-digit numbers in seconds
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2
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139
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July 19, 2020
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Question about mental abacus/soroban
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3
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132
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July 17, 2020
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Program flash anzan ALL operations
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4
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140
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July 16, 2020
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Help flash anzan
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4
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156
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July 16, 2020
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Duplex method for squaring numbers very quickly
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14
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4112
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July 11, 2020
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Is abacus speed calculation really useful or just a gimmick?
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10
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1001
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October 7, 2019
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Flash Anzan Tips?
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5
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306
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July 1, 2020
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99x99 Times Table CSV
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2
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200
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June 29, 2020
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Pythagoras Theorem proof using Sine Formula
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2
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333
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June 25, 2020
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Memoriad Addition Task example
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9
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589
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June 21, 2020
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Mathematical Wizadry by Harry Lorayne
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2
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265
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June 17, 2020
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What's a good way for a 14 year old to train?
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6
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223
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June 17, 2020
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Mental Divisions for Dummies
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4
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341
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June 17, 2020
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Miguel Angel Romero Munguia, the 13th Root Mental Champion
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2
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218
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June 17, 2020
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Day of the week, given the date
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21
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687
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June 12, 2020
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Binary numbers techniques
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19
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1060
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June 10, 2020
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Fastest way to learn mental math
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8
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2490
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April 6, 2018
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Books on creating puzzles? Or, creating codes?
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8
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571
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June 5, 2020
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