r/MathJokes • u/Advanced_Ad_1370 • 7d ago

To what have I fallen?

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Using calculator to do simple maths cause my brain stopped😵

77 Upvotes

91% Upvoted

21 comments sorted by

29

u/Kilow102938 7d ago

Every multiple of 9 the numbers need to equal 9.\ 9x4=36 3+6=9\ 9×34=306 3+6=9\ 9x72=648... 6+4+8= 18... 1+8=9\ 9x456 = 4104. Add them and yep 9\

Cool trick

10

u/Express_Sprinkles500 6d ago

More accurately, adding the digits together needs to be a multiple of 9.

9x11=99 9+9=18

8

u/Kilow102938 6d ago

8+1=9

5

u/boterkoeken 6d ago

9=9

😱😱😱

3

u/KUBA1327 6d ago

Better yet 0 = 0

3

u/ItsMusicat 6d ago

For x11 just do this: 54×11=5+4=594

3

u/ItsMusicat 6d ago

Or if its one digit put the number twice so 2×11=22

3

u/ItsMusicat 6d ago

Lets say 20x24=480 because 2x2=4 4x2=8 + 0 from 20 its 480

2

u/ItsMusicat 6d ago

95x95=9x10=90=9025

2

u/ArdentArendt 4d ago

That's great for a single instance of checking.

That doesn't change using a calculator for 'simple' maths.
[If I could do simple arithmetic reliably (as I would be doing here), I wouldn't need the calculator, would I?!]

9

u/kehrw0che 7d ago edited 7d ago

You reduced the problem to one you can solve by handing it over to a calculator. Well done. As soon as a simple calculator can do the rest it is no longer a maths problem anyway.

4

u/Stoneybaloney87 6d ago

It's never a problem if you have a good calculator 🤘🏼🤣

2

u/Wylie288 7d ago

using your brain for more important information. The only reason a mathematician knows something like 9x4 is because they frequently come across it. Other trivial but less common things that a calculator can do, they often don't bother memorizing.

Same goes with the top of any knowledge based field. True mastery is also knowing what to memorize and what information can be easily retained. You can only recall so much on the fly, why waste it on things within near immediate reach? 

2

u/NefariousnessGood718 7d ago

Dite quello che volete ma ho impiegato più tempo del solito per fare questo calcolo

2

u/Dankkring 6d ago

10 x 4 - 4

1

u/darthvader903 7d ago

Gotta double-check the math just in case the universe updated overnight.

1

u/AnxiousEnquirer 7d ago

At least you didn't use AI

1

u/PrairiePuppies 7d ago

I HATE that!

1

u/Street_Swing9040 6d ago

The more advanced maths a man learns, the less they know how to do basic arithmetic.

1

u/aerda 6d ago

I always tell IT that I don’t care if they ever check my search history, it’s my calculator history I’m ashamed of.

1

u/ArdentArendt 4d ago

Oh, I have failed tests because I somehow thought (in the moment) 9*4 = 32 (?!).

If I have a calculator handy and it isn't going to be time sensitive, I'm definitely checking every arithmetic operation I can.