<i>"Excel follows the IEEE 754 specification on how to store and calculate floating-point numbers"</i><p><a href="https://people.eecs.berkeley.edu/~wkahan/Mindless.pdf" rel="nofollow">https://people.eecs.berkeley.edu/~wkahan/Mindless.pdf</a> disagrees with that (the author knows a bit about IEEE 754, having been "the primary architect behind the standard" (<a href="https://en.m.wikipedia.org/wiki/William_Kahan)" rel="nofollow">https://en.m.wikipedia.org/wiki/William_Kahan)</a>)