rounds the numbers (...) to try to make it less obvious

Math isn't "trying" to do anything, it's just math. This statement is like claiming 2 plus 2 is "trying" to equal 4, or that 4 is "trying" to be 2 times 2. And the reason they round up the numbers is so they make more sense / are accessible to everyday people --- say, you might not immediatelly know what "0.666 feet" looks like, whereas "8 inches" is a measure everyone can picture more easily.

And yeah it's not "coincidental", because coincidences are a non-issue in math - because by themselves numbers don't mean anything other than a logical relationship between things (ratios, sums, rates, amounts, proportions).
If you divide 2 by 3, what do you get? You get 0,6666666(...) and what does that mean? It doesn't mean anything other than that 2 divided by 3 is 0,6(...666666...).

rounds the numbers (...) to try to make it less obvious

Math isn't "trying" to do anything, it's just math. This statement is like claiming 2 plus 2 is "trying" to equal 4, or that 4 is "trying" to be 2 times 2. And the reason they round up the numbers is so they make more sense / are accessible to everyday people --- say, you might not immediatelly know what "0.666 feet" looks like, whereas "8 inches" is a measure everyone can picture more easily.

And yeah it's not "coincidental", because coincidences are a non-issue in math - because by themselves numbers don't mean anything other than a logical relationship (ratios, sums, rates, amounts, proportions).
If you divide 2 by 3, what do you get? You get 0,6666666(...) and what does that mean? It doesn't mean anything other than that 2 divided by 3 is 0,6(...666666...).