Mental Calculation, Mathematics, and Puzzles


Topic Replies Activity
About the Mental Calculation, Mathematics, and Puzzles category 1 October 27, 2018
Memoriad Addition Task example 8 March 28, 2020
Books on creating puzzles? Or, creating codes? 7 March 27, 2020
Why I give up mental arithmetic 8 March 10, 2020
Is Anyone Using Kaktovik Iñupiaq Numerals to Speed up Their Math? 32 March 6, 2020
Maths ...You would consider Insanity 3 March 4, 2020
Looking for a Mental Math Training App 7 July 17, 2019
Katherine Johnson Dies at 101; Mathematician Broke Barriers at NASA 1 February 24, 2020
Stuck in rubiks cube. Only last two corner pieces are interchanged. 4 February 24, 2020
Willem Boumans new world record 5 February 11, 2020
How to calculate the day of any given date 3 February 4, 2020
Memoriad Additions: how to solve it quickly? Part 2 2 February 3, 2020
38 + 85 by Finger Maths? 9 February 2, 2020
The importance of mental calculation 4 February 1, 2020
Memoriad Additions: how to solve it quickly? 11 February 1, 2020
"Left to Right'' or "Cross-Multiplication''. Which one is better? 15 January 21, 2020
Memoriad mental addition of ten 10-digit numbers 5 January 19, 2020
Cross multiplication: How to multiply 3+ digit numbers? 17 January 17, 2020
9th Mental Calculation World Cup 2020 1 January 17, 2020
Help me to memorize (stock) numbers composed by more than 5 digits 9 January 8, 2020
9307 × 7992 by Soroban? 5 January 8, 2020
Alphabetical puzzle 4 December 30, 2019
A very easy mentally way to calculate logarithm 1 December 2, 2019
How to solve this Soroban addition? 7 December 17, 2019
What are your books about mental calculation? 3 December 14, 2019
Rinne Tsujikubo. 13 years old Japanese girl 9 December 14, 2019
De kunst van het hoofdrekenen (Art of Mental Calculation) 5 December 5, 2019
An alternative way to mentally calculate LOGARITHMS and ANTILOGARITHMS 1 December 3, 2019
Mentally calculating trigonometric values 1 December 2, 2019
Calculating squares and higher powers using division and addition 12 November 30, 2019