woliveirajr
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 Aug 18 awarded Yearling Apr 3 answered Can a coin with an unknown bias be treated as fair? Feb 12 comment MENSA IQ Test and rules of maths @ppumkin there's something called "fair use" about copyrighted material... and you can always tell us what was the original question, without using their exact words. Oct 3 awarded Critic Oct 3 awarded Editor Oct 3 revised Riddle: 1 question to know if the number is 1, 2 or 3 edit to make it correct as descirbed Oct 3 suggested approved edit on Riddle: 1 question to know if the number is 1, 2 or 3 Aug 29 comment Is there another simpler method to solve this elementary school math problem? :) and that's the graphical way to show what I answered and was "it's not different from Robert Israel answer"... graphical are always a good way to start Aug 28 comment Is there another simpler method to solve this elementary school math problem? Except that you don't need to multiply any variable by 2 or 3, you just keep adding up... Specially because the question asked for a "simpler method". Just adding up does this. Aug 28 comment Is there another simpler method to solve this elementary school math problem? step by step explanation, trying first with one wheel per student, since I don't how "elementary school" is the child... Aug 28 awarded Teacher Aug 28 answered Is there another simpler method to solve this elementary school math problem? Aug 28 comment Decipher the greeting card $( X^2 +Y^2 -1 ) ^3 - X^2 Y^3 = 0$ I got curious about the XXX at the end :-D Jun 6 comment $10=c+d$ and $c$ is one more than $d$. Observe that (the piece you transcribed) doesn't limit 'c' and 'd' to be integers... May 14 comment What could be better than base 10? It's not a XKCD, but I think this comic is mandatory here... cowbirdsinlove.com/43 Feb 25 awarded Citizen Patrol Nov 22 awarded Commentator Nov 22 comment How to explain that division by $0$ yields infinity to a 2nd grader 1st: you could try parenting.stackexchange.com ; 2nd: I'd like to know what was tought to all those falks when they were in the 2nd grade and had to learn what was "2/0". Because it's clear that now, in their ages, everybody gets the idea that "x/0" is not defined and so on, but I don't think they learn that in the 2nd grade, and somehow they got the right answer afterwards... Oct 5 comment How do you find the center of a circle with a pencil and a book? +1 for the BAROMETER link. And regarding size of book and pencil and circle: the OP provided the pictures of everything, and it's possible to observe that the circle is smaller than the book and the pencil... Oct 5 comment How do you find the center of a circle with a pencil and a book? This reminds me when I didn't got a "correct" in an answer I provided, when I should use 3 microprocessor instructions to have something done and I could do that with just 2 instructions... some teachers can be boring, sometimes... You don't really need to use the book.