How to Do Math In Your Head : Quick Math Tricks: Using 2 to Simplify

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Uploaded by on Feb 22, 2008

Learn math tricks to use two to simplify math problems in this free video series. Get mental math tips from these online tutoring lessons.

Expert: Sean Salazar
Bio: Sean Salazar has taught in both Schools and Community Centers, specializing in Math and English.
Filmmaker: sean salazar

Category:

Science & Technology

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Standard YouTube License

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  • @tissa71 a lot easier is to use a caculator

  • Takes too many steps.

    If you do it like this:

    50*67= (6700 / 2) = 3350

    2*67= 134

    3350 - 134 = 3216

    It requires less calculations.

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  • @noxure Do something like that

    50*67=?

    5*6=30 5*7=35 delete that zero and write 335. Then multiply it by 10 coz its 50 not 5. xD

    another one :

    30*46=?

    3*4=12 3*6=18 then youll get 1218. do this : 1(2+1)8 = 138 and + 0 its 1380

  • ...I noted that 67 x 3 is 201, which is very easy to multiply by any 2-digit number...and 3 is a factor of 48, thus: 48 x 67 = (67 x 3) x (48 / 3) = 201 x 16 = 3216.

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