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New posts in mental-arithmetic
Daily exercises to speed up my mental calculations?
arithmetic
big-list
mental-arithmetic
Books, sites, guides about mental arithmetic by hand and tricks?
reference-request
arithmetic
book-recommendation
online-resources
mental-arithmetic
Mental Primality Testing
number-theory
divisibility
primality-test
mental-arithmetic
Doing simple math in your head
arithmetic
mental-arithmetic
Did Feynman mentally compute $\sqrt[3]{1729.03}$ by linear approximation?
calculus
numerical-methods
power-series
popular-math
mental-arithmetic
What is the fastest way to multiply two digit numbers?
arithmetic
mental-arithmetic
Mental estimate for tangent of an angle (from $0$ to $90$ degrees)
trigonometry
estimation
mental-arithmetic
How to find a volume of this figure (which is $3080 \text{ cm}^3$) in a few seconds?
recreational-mathematics
volume
mental-arithmetic
a big number that is obviously prime?
prime-numbers
arithmetic
recreational-mathematics
mental-arithmetic
How can I easily double any size number in my head?
soft-question
arithmetic
mental-arithmetic
How do people perform mental arithmetic for complicated expressions?
algebra-precalculus
recreational-mathematics
mental-arithmetic
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