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80This is the story of the late Jakow Trachtenberg, and how to scam people using your mathematical tricks.
As an adult with kids in school, I found it terribly frustrating that school mathematics seemed to indoctrinate the kids into one way of thinking. In any problem solving scenario, there are multiple methods and several approaches. Mathematics should...
6 comments
85Expectation Value and Notation
You will find that the letter E is used in mathematics for Expected value. In English, E is for “Expectation”, for Germans “Erwartungswert”, and for French “Espérance mathématique”. Function notation: It is common to denote a function...
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82Confirmation bias, confirmatory bias, statistics, perception,
Don't believe what you see. This is an exploration of confirmation bias and how it affects our lives.
15 comments
74Bayes' Theorem - often used in disease calculations.
Bayesian reasoning (conditional probability) is an application of statistics which allows the experimenter to take into consideration existing results. For some reason applying the theorem is counter-intuitive. In some situations it is essential, and in some situations it is not applicable. Non conditional statistical reasoning is called frequentist.
2 comments66squaring maths trick how to quickly square a number that ends in 5 e.g. 35 squared.
You need to compute 35 x 35. Instantly, a child can answer "3 x 4 = 12 so 35 squared is 1,225" The number must end in 5, although numbers over 99 are a little harder, and as they get larger it gets harder. Even so, it's a useful trick for...
5 comments
67how to add up quickly
The traditional method of adding numbers relies on remembering too much. We will see a method where you don't need to add much beyond 11. The method takes a little practice, but once you master it it becomes...
0 comments79how to multiply any number by 11 in one step
Multiply 11 by 11. Method, imagine a zero in frontof the first number. 011 This is the number to be multiplied by eleven. Work from left to right. Add 0 to 1 = 1 Move to the next number. Add 1 to 1 = 2 ...
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