Understanding the Graphical Method of Multiplication

[gabrown]

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


cheers

gabrown

 

[Quantumduck]

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

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.