Strange Panzers lying in ponds distributing shells is no basis for a system of government…

Fuck. I had to calculate 4% of 7 a few minutes ago and didn’t know this. I say fuck because it wouldn’t have helped me anyway.

This is far too useful to be a shitpost.

Just always convert the percentage to a decimal, and it’s easy either way.

0.06x50 is as easy as 0.5x6. They’re both just 5x6.

All these comments like “What about 47% of 3.11?” Well, yeah, of course it’s harder to multiply two- and three-digit numbers than it is to multiply single-digit numbers.

True mathematics derives from established mathematical theory, not some farcical aquatic armored vehicle!

Oh panzer of the lake, why am I still single?

It was recently discovered that all AI everywhere was connected to the Panzer all along. /s

Yo what

Everyone’s talking about this math. I’m wondering about the panzer.

6% of 50

6/100 * 50/1

(6 * 50) / (100 * 1)

(50 * 6) / (100 * 1)

50/100 * 6/1

50% of 6

Works for multiplying any fraction, not just percents.

2/3 of 5 is the same as 5/3 of 2.

2/5 of 7/8 is the same as 7/5 of 2/8.

I was waiting in a car in front of a math tutoring building and was doing the math problems advertised on their window (as one does, of course) and the 7% of 250 is indeed probably easiest as 250% of 7, aka 2.5x7, which is 17.5.

I did it a few other ways, though. 7% of 1000 is 70, then divide by 4 for 17.5. Well, more like, divide by 2 for 35 and again for 17.5, but yeah... mental math is fun.

Another counter-intuitive percentage fact: A 10 percent discount and a 10 percent fee can be calculated in either order but they don't cancel out.

Example, 90% of (110% of 10) = 110% of (90% of 10). But neither of those is evaluates to 10. They evaluate to 9.9.

For any percentage X, and any base value C, (100 - X)% x ((100 + X)% x C) = (100 + X)% x ((100 - X)% x C) = (100 - (X^2/100))% x C

Thanks tanks!

Let's try this on a sale item. Hmm, let's see, the sign says 25% off $6.99. So that's the same as, let's say, 7% off $25. Oh, yeah, that is much easier. /s

In either case I would multiply 5 by 6 and move the decimal. Interesting though.

transitive and commutative

Holy shit you solved my life there

Great for calculating tips!

Let's see: the bill was $138.72, so I just need 138.72% of 20. And we can subtract 100% and just add the 20 back at the end, then convert the percentage to a decimal so (.3872 * 20) + 20 = 7.744 + 20 or $27.74.

Easy!

How is 17% of 83.27 easier then 83.27% of 17?

I hate math so much.
Thank you for this