About the Mental Calculation, Mathematics, and Puzzles category


1

1011

October 27, 2018

Do you want to learn soroban and flash anzan? Click here for classes online with record holder in memoriad: Jeonghe Lee!


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1781

May 28, 2020

Mental Calculation Competitions in 2020 and 2021


2

167

May 23, 2020

Simple times tables help for a 30 year old


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392

May 13, 2020

Secrets of Mental Math


68

6503

May 3, 2020

New Member


2

111

May 3, 2020

"Left to Right'' or "CrossMultiplication''. Which one is better?


16

731

May 2, 2020

Numbers are Amazing


26

424

April 25, 2020

Math formulae


3

349

April 24, 2020

Repetition of Numbers while Summation of Sequences


5

192

April 21, 2020

A note on Factorial Function obtain by Piyush Goel


2

209

April 21, 2020

Trick for squaring 2 digit numbers above 50


9

933

April 20, 2020

Mirror, Inverted, and Ambidextrous Writing


3

370

April 18, 2020

Pythagoras Theorem proof using Sine Formula


1

152

April 17, 2020

A New Way the Area of Trapezium by Piyush Goel


4

191

April 14, 2020

Memoriad Addition Task example


8

381

March 28, 2020

Books on creating puzzles? Or, creating codes?


7

389

March 27, 2020

Why I give up mental arithmetic


8

552

March 10, 2020

Is Anyone Using Kaktovik Iñupiaq Numerals to Speed up Their Math?


32

1996

March 6, 2020

Maths ...You would consider Insanity


3

439

March 4, 2020

Looking for a Mental Math Training App


7

5531

July 17, 2019

Katherine Johnson Dies at 101; Mathematician Broke Barriers at NASA


1

337

February 24, 2020

Stuck in rubiks cube. Only last two corner pieces are interchanged.


4

418

February 24, 2020

Willem Boumans new world record


5

466

February 11, 2020

How to calculate the day of any given date


3

529

February 4, 2020

Memoriad Additions: how to solve it quickly? Part 2


2

347

February 3, 2020

38 + 85 by Finger Maths?


9

479

February 2, 2020

The importance of mental calculation


4

646

February 1, 2020

Memoriad Additions: how to solve it quickly?


11

531

February 1, 2020

Memoriad mental addition of ten 10digit numbers


5

346

January 19, 2020
