Behold the utopian sci-fi paradise that exists because someone decided decimal places are for weaklings! In a world without significant figures, 100 = 100.0 = 100.00 = 100.000000 and your chemistry teacher's soul just left their body.
This is why you got a 50 instead of 100 on your quiz! One tiny decimal point separates us from flying cars and space-age architecture. Next time your teacher marks you down for "rounding errors," just point to this image and say "I'm trying to advance civilization, thank you very much!"