How to Do Math In Your Head : Quick Math Tricks: Multiplying Large Numbers by 5

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Uploaded by on Feb 22, 2008

Learn math tricks to multiply large numbers by five and solve 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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License:

Standard YouTube License

  • likes, 80 dislikes

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Top Comments

  • Now teach us how to divide large numbers by 2 very quickly

  • sorry m8 but i know this when I was 8

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All Comments (223)

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  • its too simple, it is nothing but divide and multiply by 2, i.e any x*5 = x*(10/2), Do you really think this to be a trick?????

  • @MrDiriko

    its called cheat and use paper! You think of it this way. 3777/2 = 1733 right? just double the second number derp

  • How do I divide 3777/2 without calculater? It´s not a primenumber, i know xD but you can do a fast lesson how to divide 3777/2 ? TRLOLOLOLOLOLOLOLOLOLOLOL

  • 5*625 =(1000*5)/8=3125

  • 56*25 =(56*100 )/4=1400

  • This is very helpful thank you

  • but how can we divide this big number without the calculater

  • 1:24

    Adding 0 does nothing, general example: n + 0 = n.

    Adding five yields always a wrong answer.

    You are multiplying by 5. Or, like Coundoner said, dividing by two then multiplying by 10.

    The reason people find math so hard is because of misused vocabulary, such as that displayed in this video. Don't confuse these fucks and tell them something important. Read a book on Vedic Mathematics. Then tell us what you've learned.

  • @arlpoon Not in this case, ignorant fuck.

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