Why does watching a video at 1.25 speed decrease the time by 20%? And 1.5 speed decreases it by 33%?

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I guess this reveals how fucking dumb I am. I can’t get the math to make sense in my head. If you watch at 1.25 speed, logically (or illogically I guess) I assume that this makes the video 1/4 shorter, but that isn’t correct.

In short, could someone reexplain how fractions and decimals work? Lol

Edit: thank you all, I understand now. You helped me reorient my thinking.

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29 Answers

Anonymous 0 Comments

You need to turn the fractions upside down to how you are thinking about them. The speed is in relation to x1.00 speed, so you divide _into_ 1.00.

1.00 speed is 100% speed, so

– At x1.25 speed this is 100%÷1.25 = 80%

– At x1.50 speed this is 100%÷1.50 = 66.66%

– At x2 speed this is 100%÷2 = 50%

Hopefully the last one is intuitive — if you watch something at twice is speed it takes half as long to watch.

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