Re:A mathematician's way of converting miles to kilometers
by crdrost on Saturday August 10, 2019 @01:17PM
(#20663276)
Yeah it's not actually that bad, the base-12 system helps you out. You multiply the feet by 3, divide the inches by 4, add, multiply by 10. Optionally add 1.5% to really get that extra precision.
It's 30.5•(a+b/12) understood as about 1.015•10•(3a+b/4).
So I am 6’4”, that becomes 18+1=19, so I am about 190cm. Adding between 1-2% gives me that I am between 192cm and 194cm. I know I am on the lower end of 6’4” (maybe 6’ 3.75”) so I usually report 192cm.
It's 30.5•(a+b/12) understood as about 1.015•10•(3a+b/4).
So I am 6’4”, that becomes 18+1=19, so I am about 190cm. Adding between 1-2% gives me that I am between 192cm and 194cm. I know I am on the lower end of 6’4” (maybe 6’ 3.75”) so I usually report 192cm.