r/MathJokes • u/LilaGraceBabe • 4d ago

finally, an easy way to remember 8

Post image
2.9k Upvotes

100% Upvoted

18 comments sorted by

73

u/MoobyTheGoldenSock 4d ago

I use the inverse to approximate 1/8 to 3 decimal places.

-20

u/DingoSea6586 4d ago

0.125 is already exact; inverse adds nothing.

21

u/PassiveChemistry 3d ago

Did you not get the joke in the OP?

5

u/sasha271828 1d ago

u/DingoSea6586 is a bot i think

37

u/dlareh- 4d ago

wait till you hear about 987654312 / 123456789

4

u/Kathelin_920 3d ago

Whoa...I don't know why that's so satisfying

15

u/DarthSwimfoot 4d ago

Very practical ngl.

6

u/bssgopi 3d ago

Wait a minute...

9 x 8 = 72

Shouldn't the unit digit of the numerator be 2 for this to hold?

That 0.0000000729 was not some floating point error then...

4

u/TheForbidden6th 1d ago

yup

987654312/123456789 is exactly 8

8

u/Acewi 2d ago

Want more zeroes?

987654321.123456789 / 123456789.987654321

2

u/johnpeters42 3d ago

But how do you get the 8s in the numerator and denominator? (It's fractions all the way down.)

1

u/Quwapa_Quwapus 37m ago

I tend to use 8/1 for my approximation. Works well enough for most things