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

The math makes a lot more sense if you use fractions instead of decimals.

Watching it at 1.25 speed means you’re watching it at 5/4 speed. To see how much time it would take, you would take 4/5th of the time, which is 80%.

Watching it at 1.50 speed means you’re watching it at 3/2 speed. The amount of time it would take (flipping the fraction) is 2/3rds of the time, which means you saved 33% of the time.

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