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Squaring two digit numbers in your head All my life I've done mental arithmetic the 'wrong way': I've calculated from left-to-right, instead of right-to-left.
Mathematical mysteries: Hailstone sequences January 1997 This problem is easy to describe but it is one of mathematics' unsolved problems.
I must have been in about fourth or fifth grade. Addition Trick | Dr Mike's Math Games for Kids
10 Easy Arithmetic Tricks Math can be terrifying for many people. This list will hopefully improve your general knowledge of mathematical tricks and your speed when you need to do math in your head. 1.
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Futility Closet is a collection of entertaining curiosities in history, literature, language, art, philosophy, and mathematics, designed to help you waste time as enjoyably as possible. You can read Futility Closet on the web, subscribe by RSS, or sign up to receive a free daily email -- see "Subscribe by Email" in the sidebar. The site is growing, so we've set up a separate blog on which readers can join in a discussion of future endeavors. Math Notes
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Edit Edited by NatK, Maluniu, Luís Miguel Armendáriz, Webster and 38 others How to Calculate a Square Root by Hand
Dance, Factors, Dance – A Variation On Yorgey's Factorization Diagrams Upon first sight of Brent Yorgey’s brilliant Factorization Diagrams , I knew that I should take his lovely little dots and make them dance. Our first tango would be inspired by the digital clock , with a separate diagram for each of the hours, minutes, and seconds. For example, we’d portray 4:34:27 am like so:
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Modeling integers When modeling integers, we can use colored chips to represent integers.
MathPickle and The Pacific Institute for the Mathematical Sciences ( PIMS ) are exploring options for establishing thirteen unsolved problems - one for each grade K-12. $1,000,000 Problems
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