Help with converting seemingly irrational decimals to nice denominators

[helicoptur]

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Does this help?:

I got the wrong answer to a computation involving decimals!

TL;DR: It's nothing to do with Snap!; it's a question of how computers represent non-integers, and will likely give exactly the same answer in any programming language. Concise answer for mathematicians: There are uncountably many real numbers, even in a finite range, and only countably many possible bit patterns in a computer. Long answer: Long strings of 9s are the tip of the iceberg: [Sans titre script pic] [Sans titre script pic (1)] Note that that second example is off by three in t…