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  • This math trick is amazing.Thank you very much for this very good video.I will try to train this math trick in my brain for mental arithmetic.

  • its an amazing video.... hope i get some easy method to find the roots of a quadratic equation

  • omg im so lost and confused

  • This is a great video but I don't get a single bit of it. This is some complicated method. thanks anyway.

  • what

  • gud stuff.....

    

  • ion get it wdf..

  • Comment removed

  • i dont get any of this

  • at 1:52 why 3+4 ?

  • 3*1=3 and 2*2=4. It's bit tricky following the pairs but you deal with the whole pink block that he makes

  • @u320017 sum of the diagonal degits thus (3x1)+(2x2)

  • i don't get this one

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