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What Happens in Your Brain When You Add 47 and 28?

Vic Mackey

By Vic Mackey
in Lulz

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ztejas

ztejas 43475

Posted
Posted (edited)
1 hour ago, woohorn said:

Is this a joke?

40+20=60
7+8=15
60+15=75

No it isn't a joke and that isn't the fastest or most accurate way of doing it if you're actually good at mental math. 

Even though Vic phrased the numbers in reverse. 

But what ChiTown said is what I do. Take the singles off the 2nd number - add the tens - then add the singles.

If I'm looking at 28 + 47 I do 8 plus 47 is 55 plus 20 is 75. 

If I'm looking at 47 + 28 I do 47 plus 20 is 67 plus 8 is 75. 

YMMV.

 

Edited by ztejas
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idigTexas

idigTexas 2289

Posted
Posted (edited)
6 hours ago, ztejas said:

No it isn't a joke and that isn't the fastest or most accurate way of doing it if you're actually good at mental math. 

Even though Vic phrased the numbers in reverse. 

But what ChiTown said is what I do. Take the singles off the 2nd number - add the tens - then add the singles.

If I'm looking at 28 + 47 I do 8 plus 47 is 55 plus 20 is 75. 

If I'm looking at 47 + 28 I do 47 plus 20 is 67 plus 8 is 75. 

YMMV.

 

Is someone timing how long each method takes?  It may take someone longer to do the "fastest" method, depending on how their brain works.  And how is one method more accurate than another if they all produce the correct answer 100% of the time?

I personally dump 28 and 47 toothpicks on the floor and then count them all Rainman style. 

 

Edited by idigTexas
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Brisketexan

Brisketexan 105155

Posted
Posted
9 hours ago, woohorn said:

Is this a joke?

40+20=60
7+8=15
60+15=75

 

18 minutes ago, mdmost said:

7+8=15

40+20=60

15+60=75

These.  And I do basic arithmetic incredibly fast and accurately in my head, using that sort of methodology.  I use it in real-time, like cross-examining a witness on damages calculation, and I can usually spit out the next number before he can do it on a calculator.  

Nobody taught that, it's just a mental shortcut that I -- and obviously lots of other folks -- developed on their own.

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SilasCoade

SilasCoade 2622

Posted
Posted
19 minutes ago, Brisketexan said:

 

These.  And I do basic arithmetic incredibly fast and accurately in my head, using that sort of methodology.  I use it in real-time, like cross-examining a witness on damages calculation, and I can usually spit out the next number before he can do it on a calculator.  

Nobody taught that, it's just a mental shortcut that I -- and obviously lots of other folks -- developed on their own.

distributive property FTW

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Dennis Taylor

Dennis Taylor 18830

Posted
Posted (edited)
10 hours ago, Vic Mackey said:

Been seeing this go around the webs.

8 + 7 = 5. 4 +2 +1 = 7.  For a total of 75. 

 

Blink 182 Reaction GIF

20 +40

8+7

 

What is this horseshit you posted?

 

PS I know a guy that can multiply 3 digit numbers by 2 numbers in his head in 3-4 seconds . It is at the same time impressive and creepy 

Edited by Dennis Taylor
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ChiTownDoc

ChiTownDoc 21154

Posted
Posted
1 hour ago, Dennis Taylor said:

 

Blink 182 Reaction GIF

20 +40

8+7

 

What is this horseshit you posted?

 

PS I know a guy that can multiply 3 digit numbers by 2 numbers in his head in 3-4 seconds . It is at the same time impressive and creepy 

Craziest shit I’ve seen in all my years is a patient who could tell you what day of the week you were born based on birthday.  And it took him less than 2 seconds.  I brought in 30 different people to stump him.  Impossible.  Freaked me the fuck out.  

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ChiTownDoc

ChiTownDoc 21154

Posted
Posted
1 hour ago, Nolacycling said:

(47 + 20) + 8

 

My middle school students would need a calculator.  

This.  I wrote it out but this is the shortest,  best way.  Other than the memorizing guy, who is likely full of shit.  

Some of you make me wonder...
 

900447CC-0E12-4BED-B915-789A333330AD.gif

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Knoxtnhorn

Knoxtnhorn 6055

Posted
Posted
12 hours ago, honolulu horn said:

Add 8 to 7 to get the ones digit (5), then add 2+1+4 to get the tens digit (7). I don't consciously go through that process -- two digit sums just sort of appear automatically for me -- but if I break down the process that's how it happens. 

This is me as well.

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ChiTownDoc

ChiTownDoc 21154

Posted
Posted
1 hour ago, Nolacycling said:

(47 + 20) + 8

 

My middle school students would need a calculator.  

 

16 minutes ago, Red Five said:

Add 30 to 47 then subtract 2. 

These 2 are basically the same and pretty much both take zero time.  I’m admittedly fascinated by this type of shit...

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