Actually even calculators or my computer cannot give you the correct answer, either.show me 12,489,326,749 x 937,562,482
The old algorithm, I learned in school, could give you the real answer, by hand, if you could live long enough to do it or have enough pencils and paper to hand write it.
We landed a man on the moon using Logarithmic Addition and IBM computers that were only good for this precision...
12489 x .9376 ≈ 1.171 x E19 [ E meaning 10 times itself 19 times or 19 trailing zeroes]
Try this on your calculator...
2/3 = ?
If you get .6666666667 , it is lie.
Oh well...
But thanks to the IEEE 754 standard and low cost memory and high speed computation, we get a precision of...
https://en.wikipedia.org/wiki/256-bit
The answer I got, in my head, was 1.2 x E19 in about 10 seconds. I had to use a "pencil point" counter to get E19.
The question is how precise you want the result.
Jim...