Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Multiplication Explaination

  1. Mar 26, 2008 #1
    I have just watched a very interesting way of multiplying 2 numbers together, but i wonder if anyone could explain to me why it works.

    here is the link

    Calculating technique - 5min - Video


  2. jcsd
  3. Mar 26, 2008 #2
    If you examine what the method is doing, it is multiplying each digit independently and then summing up the ones, the tens, and the hundreds place.

    It is the same process as long multiplication, just graphically instead of numerically. Seriously, do the problem side by side and you will see exactly the same numbers at each step.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook