How Integers And Floats Work (wizard Zines)
 

The way your computer does math is pretty weird. 4294967295 + 1 = 0! 0.1 + 0.2 = 0.30000000000000004! -2 in binary is 11111110! And what's all this jargon? Unsigned integer? Little endian? Hexadecimal? This makes math seem unpredictable, which is very rude because math is the one thing in life that should be predictable.
Of course, the way computers do math is predictable - it just plays by slightly different rules than you might expect. And understanding how your computer does math unlocks a lot of things!