anonymous
  • anonymous
I'm looking out for maths tricks, specializing in "Square of a number" Like how to find square of numbers after 30 within seconds. There must be some tricks. Because the multiplying takes time, and it's hectic, and yep, without using calculators! Squares of big numbers! like numbers after 30. Or any random number that appears.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
There's a TED talk about a guy that can do this really fast.
anonymous
  • anonymous
TED stands for?
anonymous
  • anonymous
So there ain't no tricks?

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anonymous
  • anonymous
It's a site where people talk about interesting Ideas. Here's the link: http://www.ted.com/talks/lang/en/arthur_benjamin_does_mathemagic.html
anonymous
  • anonymous
Don't know if it'll help you though.
anonymous
  • anonymous
No worries, thank you for the link Thomas. The question is still open guys! :]
KingGeorge
  • KingGeorge
It might be helpful to memorize the squares of 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 200, 300 up to some point. Fortunately, these are relatively easy to memorize.
KingGeorge
  • KingGeorge
Also, if you can get the rules down for polynomial expansion, that could be very useful. E.g., \[312^2=(300+10+2)(300+10+2)\]\[312^2=300^2+10^2+2^2+2\cdot(300\cdot10+300\cdot2+10\cdot2)\]\[312^2=90000+100+4+2\cdot(3000+600+20)\]\[312^2=90104+2\cdot3620\]\[312^2=90104+7240\]\[312^2=97344\]
KingGeorge
  • KingGeorge
Other than that, memorization and practice are the best way to go.

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