Why does 0.1 + 0.2 = 0.30000000000000004?

span { padding: 0 !important; } Hello! I was trying to write about floating point yesterday, and I found myself wondering about this calculation, with 64-bit floats: >>> 0.1 + 0.2 0.30000000000000004 I realized that I didn’t understand exactly how it worked. I mean, I know floating point calculations are inexact, but: there’s a floating point number that’s closer to 0.3 than 0.30000000000000004! So why do we get the answer 0.30000000000000004? This doesn’t always happen – 0.2 + 0.3...