Mental Calculation, Mathematics, and Puzzles


Do you want to learn soroban and flash anzan? Click here for classes online with record holder in memoriad: Jeonghe Lee! (13)
Any good learning materials on the abacus method? (4)
Hello world (2)
Calculating logarithms (2)
Flash Anzan - How Much Time Does It Take To Master (4)
Revisiting 13/97 (1)
Fast division by 23 (8)
Study Finds Chess Significantly Improves Creative and Critical Thinking Skills (9)
Dividing by full reptend primes (6)
Calculating odds in poker? (4)
Soroban - can I use my left hand? (3)
More division tricks. Numbers ending in 1 or 2 (5)
does the abacus have a real advantage ? (8)
Mental Calculation - Division - Resources? ( 2 ) (27)
Very quick division trick for numbers ending in 9 or 8 (2)
Flash anzan and techniques (2)
Help choosing a system for mental math ( 2 ) (22)
Creative ways of multiplying differently (1)
Best association system for numbers 0 - 999? (7)
Memorizing squares up to 999? (6)
Organizing and implementing mental calculation mnmonics (4)
Duplex method for square roots (3)
Duplex method for squaring numbers very quickly (7)
Best books on Math prodigies and Speed Math (6)
Paper on calendar calculations – determine the year’s share for the day-of-week (2)
Chinese short division (9)
Division with 2 digits simultaneously! (12)
Three digit division (2)
Soroban and flash anzan (8)
Speed division (3)