This is decent for some multiplications, but bad for when 2^n - 1 is on the left. Every halving will create another odd number, so the number of additions will be maximized. It would be faster to do 2^n times your second number minus 1 times your second number.
swpickle, it does work, but Heidi missed the fact that if the first number is odd, you have to add that number to the sum, too... so if you multiply 13x24, you have to add numbers corresponding 13, 3 and 1 not just 3 and 1...
Russian peasant multiplication is so good i have understand it the problem is that i could not get multiplied by 8 please madam i need correction there
@@woodchuk1 I am no math expert; but, I noticed that the teacher’s example problems both started with even numbers. After underlining, these appear to be excluded from the calculation. However, they are not excluded. It is only the fact that the first digits of her problems are even that causes them to be excluded. This was not shown.
Fun fact this is the way a computer does multiplication
How?
This is the clearest explanation of the method I have ever seen. Thank you!
No matter which method you use,kt takes more time and gets complicated
The best method is the original arithmetic,its fastest and easiest
With math skills kids have now this won’t work. They can hardly figure out the half of 5
This is decent for some multiplications, but bad for when 2^n - 1 is on the left. Every halving will create another odd number, so the number of additions will be maximized. It would be faster to do 2^n times your second number minus 1 times your second number.
Goddammit this is how I do calculations in my mind
I don't think this method works when multiplying 2 odd numbers together. Actually it does not work if the first number is odd.
swpickle, it does work, but Heidi missed the fact that if the first number is odd, you have to add that number to the sum, too... so if you multiply 13x24, you have to add numbers corresponding 13, 3 and 1 not just 3 and 1...
@@zbanovic Thank you for that explanation. And it makes complete sense.
Russian peasants must have been laborious and patient. Slow and steady would win the race in those days. Good for history students.
It’s good but easier and faster just to multiply
Russian peasant multiplication is so good i have understand it the problem is that i could not get multiplied by 8 please madam i need correction there
Sorry 8 multiplied by 9
8 9
4 18
2 36
1 72
The first three columns are all even on the left so they are ignored. The answer is what’s left on the right - 72.
All health and normality in the future
Easy but not fast, can't be done orally
Madam I got 19 × 12 wrong
Pls correct me
19 12
9 24
4 48
2 96
1 192
The rows with 4 and 2 at the left are eliminated, and the remaining numbers on the right when added give 12+24+192, or 228.
@@woodchuk1 I am no math expert; but, I noticed that the teacher’s example problems both started with even numbers. After underlining, these appear to be excluded from the calculation. However, they are not excluded. It is only the fact that the first digits of her problems are even that causes them to be excluded. This was not shown.
this system does not always work.
Me who study binary theory : 👁👄👁
But seriously tho, it does work everytime
What an incredibly stupid way to multiply.