We are not taught that multiplication table method in America, but we should be! That’s waaay easier and more efficient than the longhand multiplication we’re taught!
It's easier to do this in binary as the exponent here is of 2. 2^20 is simply a 1 with twenty zeroes. Subtract 1010001 from 100000000000000000000 and you have your answer.
The point is pretty obvious? It's how to solve a specific Olympiad question for which you obviously cannot use a calculator. Else the poster wouldn't have made this video right
We are not taught that multiplication table method in America, but we should be! That’s waaay easier and more efficient than the longhand multiplication we’re taught!
Are you taught Elizabethan multiplication?
This is actually now part of the 4th grade standard for states using Common Core, so for some students it is.
I've been using it since I was around 6 years old haha.
It's easier to do this in binary as the exponent here is of 2. 2^20 is simply a 1 with twenty zeroes. Subtract 1010001 from 100000000000000000000 and you have your answer.
After realizing it was 1024*1024, my muscle memory was then expecting a difference of squares...
or you can grab a calculator - what's your point
Agreed. There was no new technique shown there. It was just brute force.
The point is pretty obvious? It's how to solve a specific Olympiad question for which you obviously cannot use a calculator. Else the poster wouldn't have made this video right