Ten seconds of math
mental-math-trainer.com
mental-math-trainer.com
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It's even easier to do stuff the right way, especially in a one page design. Just leave the logic up above. Then put a long, well written text about math, the importance of brain exercise and a description of the game with well divided H1/H2 headings, below it. Here's all the SEO you need. The link from HN and all the sites that scrape it will do the rest.
(I hate backspace-to-go-back. It's the worst feature in a browser. Is there a way to turn it off?)
This mental math exercise is a cool and fun concept! Good execution.
I love this feature. Makes browser navigation keyboard friendly.
Different strokes for different folks I guess.
function getRank(score) {
// TODO we should add a real ranking one day
var ONE_BARELY_REACHES_THIS_SCORE = 200;
return Math.floor(100 * Math.min(Math.E * score / (ONE_BARELY_REACHES_THIS_SCORE * Math.PI), 1));
} foo=true;$("#question-answer").bind('keydown', function(){if(foo)$("#question-answer").val(eval($("#question").html()));$("#question-answer").keyup();foo=!foo;});is it generating random numbers with random operators i between them and evaluating whether the solution given by the user is correct and count the number of correct responses??
By crucial step i meant the logic on how he calculates the percentage of people below.. how it changes when the operators used are changed.(is it dependent on operators in the first place? ) and when the range is changed? etc..
In addition to a leader board, it needs to: - Have a time limit and see who can get the most calculations done on that fixed time - or, have a fixed number of calculations and see how fast people can answer them - or, it could get faster as you progress
The calculation of the "you are better than X%" needs to be fixed because everybody in my office was better than 100%
I noticed that with, for example, multiplication, I have a set of rote-learned answers for calculations that aren't 2, 5 or *10, and if the answer isn't one of those answers, I'll get the closest answer I can remember, and work back/forward from that. It's entirely habit, and I can't stop myself doing it. Algebra as well, I always have a moment where I swap parts of the equation in my head; even if it's utterly simple, there's still a noticeable cognitive step.
For the rest it was more about staring at the numpad (which I never use) and typing in my answer. If I typo'd I lost several seconds as I'd not have a finger on backspace :(
n^x = (n-m)(n+m) + m^2
so for 23:
23^2 = 20*26 + 9 = 529
just as
Typing != Programming
Sure, typing is a useful skill, it's part of programming, but is it programming? - no of course not. In fact it's insulting to programmers to make the confusion.
It's the same with those of us who have taken the time to get good at mathematics - it's not arithmetic. Being good at arithmetic does not mean you are good at math, being good at math does not make you good at arithmetic.
This confusion is especially detrimental to children, many of whom will be put of mathematics because they equate it with the wrote learning and peculiar mental gymnastics of arithmetic, rather than what it is: An exploration of the beautiful and fundamental symmetries that emerge from structure and process.
Maybe they plan to extend the site to include trig, algebra, calculus, etc. problems?
Yes, really. "Arithmetic is the branch of mathematics dealing with integers or, more generally, numerical computation" -- http://mathworld.wolfram.com/Arithmetic.html
> Mental arithmetic is to number theory as being able to type is to programming.
To paraphrase you, number theory != mathematics. (But number theory ⊂ mathematics, just as arithmetic ⊂ mathematics.)
> That you do not understand this, shows that you too have been damaged by the standard teaching of maths within education - pre university level.
That's a bit rude, and also inaccurate.
I grade school many are taught that math === arithmetic. Then they get to interesting stuff in high school and college and realize arithmetic was just a tiny part of the story. So many at that phase are emphatic about refuting what they were told early on about arithmetic being math. Then when you calm down from that notion, you can get back to realizing that while arithmetic is only a small part of math, it is still very much a part.
In other words, it's something basic that you have to be able to do efficiently in order to achieve higher goals.
arithmetic -o '+-x/'
I find it a handy supplement to 'gtypist' in order to train touch-typing of numbers.
On a side-note: I'm surprised at how scarce such software is - pitiful as it may be. But then, the advancement of the human intellect isn't at the forefront of our cultural conscious, is it?
window.setInterval(function(){$('#question-answer').val(eval($('#question').html().replace("×","").replace("÷","/").replace(/(.)²/,"Math.pow($1,2)").replace(/√(.*)/,"Math.sqrt($1)"))).trigger("keyup")},10)
There is nothing wrong with client-side tools. I have a few on my site that get decent usage. But unless you put some security and validation on the server-side, any data coming back is not trustworthy.
I used it to memorize the times table up to 20x20.
1,1,1
1,2,2
2,1,1
2,2,4
3,1,3
I think the change in performance here has something to do with never returning to the home row; I'm just completely lost on laptops.
I am sure this will be easily beat by all the caffeinated people pretty soon.
Updated: this is actually easier with all the other options enabled because you get easy things like sqrt([4, 16, 25]), x * [0,1], and x / [1, 2] a lot. I was actually over 30 seconds on timer when I hit 18^2 question. "You scored 576. You are better than 100 %"
Updated 2: I tried raising number limit to max (1000) and suddenly life on hard mode. I got through 272/16 and 930/31, but third question 127 * 49 killed me. "You scored 64. You are better than 27 %"
No real ranking data is being used in this calculation
Score multiplier and number of operators selected directly influence the score. So setting slider to 10 and enabling all operators gives 7 points per question and increasing slider to a 100 raises that to 16 points per question.
I have the exact same problem. Interestingly, it's a problem for me both in my native language and in several other languages I learned to fluency. So clearly, the "hears numbers" part of my brain is deficient.
I've actually practiced to try to overcome this, and made no progress.
On the other hand, I'm quite good at visual calculations, and also at remembering numbers when I see them. So if I bother writing down a phone number, I can easily remember it for a long time.
But hearing it? Nothing.
If you don't care about the setting: 1. Click "Play game" 2. Press 2, Enter, Star once it loads.
Make 24. Enter the two intermediate results. Numpad plus repeats the question.
I don't know if this is a good place to start if you have trouble hearing but might be fun for practice anyway.
https://play.google.com/store/apps/details?id=com.woodenclos...
I find the hard level pretty hard - it would be good IMO if you could change the mode to include negatives (maybe roots and squares [+other powers?], like here) and to expand the number range to. I seem to remember someone mentioning (probably on here) that they played a mental maths game where you had to give an operation on a number, you didn't say the answer but the next person had to add an operation, there was always a range (age adjusted) that the answer had to fit within: was that game the inspiration or was it just a novel idea for you?
Like the game anyway, thanks.
setInterval(function() {document.getElementById('question-answer').value = Number(document.getElementById('question').innerHTML.split(' ')[0]) + Number(document.getElementById('question').innerHTML.split(' ')[2]); $('#question-answer').trigger(jQuery.Event( 'keyup', 16 ));},500)
Feel free to test it and let me know :D http://www.mental-math-trainer.com/
For those who are still struggling with mental arithmetic, or kids just learning, this seems like it would be a great way to practice --- there is a a certain addictive quality to it, like "flappy bird".
i know the guy who made this game for iOS
https://itunes.apple.com/us/app/brain-tuner-free/id391266485...
https://itunes.apple.com/us/app/brain-tuner-x/id287360582?mt...
setInterval(function(){ $("#question-answer").val(eval($("#question").text())).trigger("keyup") }, 2001);
This effect is a lot more tangible with longer, multi-step problems. In college (physics major) I made a point of doing every integral in my head if I could, and over time I found that my mental 'scratch space' seemed to be getting longer - that I could hold more in my short-term memory at once.
I've also observed that being a person who is 'good at math' approximately correlates with being a person who does math in your head.
[Related observation: that students strongly segregate into "good at math" vs not, as though many people are completely incapable of a mode of thought that comes naturally to others. I think it's trainable, and people who never do any math, especially in their heads, are specifically not training it.]
These are entirely anecdotal and I'd love to find more concrete data, but, right now I would absolutely vouch for mental math training.
If you're reading a graph, you should be asking yourself a ton of questions about it. A lot of those questions can be answered with mental math if you're proficient at it. If you weren't, you'd have to resort to a calculator or other tool, and the switching cost keeps most people from doing this:
examples: what's the ratio between these two values? How did it change? I have this per minute (or, in my case, a per 4 minutes) rate. What is that per day? How much did that drop by (absolute and relative)
The point isn't that people who are bad at math can't compute these things in the real world. They can, and often do, whether with calculator, on paper, slower in their brains, or with a different query or better analysis tool. But people who do these operations quickly mentally do it more, do it more quickly, and can digest and filter more numeric information.
I think clicking is easier than typing.
Similar concept but with cross platform multiplayer.
FF 33.1 on Mac if that matters.
You scored 666 You are better than 100 %
Addition up to 1000 is reasonably fun, but also feels like it would be doable for a really long time with a physical keyboard and at full attention (I got 3328).
That also is a weak point of games like this. IMO, games are good if you can play them without attending to them or when they provide interesting problems. Games with dull problems that require your attention fail. A prime example of the first game type is Tetris; I use to say that your spinal cord can play it. Examples of the second type are Sokoban and (a million times so) DROD (http://en.m.wikipedia.org/wiki/Deadly_Rooms_of_Death)
With all operations checked and numbers up to 1000, I find I need more time, and scoring seems brutal (only 16 points after 2 or 3 correct amswers?)
I also find it a bug that you get subtractions with negative numbers as answers.
Finally, is it a bug or a feature that starting a game gets you the same problem and partial answer that the last game finished with? It helps in doing a post-mortem, but can make it really hard to get that first answer right.