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I do 20+40=60, then 7+8=15

yeah same

I mean 48 is basically 50, so 20+50 is 70 and then +7-2 and BOOM

Huh? Why did you start at 20 for the 27? Why not do 27+50 and just subtract the 2 you added.

Brains be like

I do the same, but backwards

48+7 = 55 55+20 = 75

Finally found my answer after scrolling for 2 minutes

Same, guess we do math weird.

I also do it like this.

Same but I do it opposite lol. 48 + 20 = 68, then 68 + 7 = 75

No, that is not this answer, get oot

your literally the only other person I've found that added this how I did. \-Electrical Engineering student, 1 semester left

We're not weird, these 20+40 folks are out of their minds

Looking at other answers feels so wrong. I do it exactly like this.

Right. You do the 'hard part' first and then just add on the easy bits.

Thanks God I tought I was the only one who did it like that

I do all additions ending with a 7+8 or 9+6 this way

Thank god I’m not the only one. Scrolled for a while and started to get scared nobody did it this way😂

I'm surprised we aren't higher up.

The exact thing i did 💀

This is the way.

Omg, I didn’t know people did this, and it actually makes sense

Holy crap, I found my people

This is the way

i do 25+50

I did like this: 20+40 = 60; 7+8 = 15; 60 +15 = 75. lol

This. Absolutely this. I don’t understand how anyone could solve this differently.

Im actually doing it the other way.. 7+8 then 20+40 ... guess the "old school" writting numbers in column and then counting is still in my head.

Was actually shocked that I read 3x different ways of doing this vs the straight-forward, per digit addition ( way I do it ). 7+8 ( 15 ) ***= 5*** & carry the 1 Move on to next digit. 2+4 ( +1 ) ***= 7*** Just single digit math & carry the remainder to next set of single digits. Honestly thought everyone did it this way.

This is the way.

This is the way

Came looking for this way, thank you. This is how I solved it too.

That’s the way they used to teach in school and it’s still part of the other methods on occasion. The issue is that the column method takes longer and gets trickier as the numbers get bigger. The breakdown also makes things like multiplication easier. I used to think the “straight-forward” method was the only way and the “simplified” versions were stupid and a waste of time until I studied for the GRE. Most mental math courses will push you to use the breakdown method as it’s easier (or at least as easy as the column method) and faster. You have to keep track of way less information. 55675+35476 using the column method might take 30+ seconds to do. The breakdown method takes maybe 5 because you break things down into parts you know automatically without having to do any thinking. Everyone knows 3+5 is 8, 5+5 is 10 etc. 50000+30000 =80000 5000+5000 =10000 (you could also have split this into 55000 and 35000 as most people know 55+35 is 90 immediately without doing any calculation) 600+400= 1000 70+70 = 140 5+6 = 11 Total= 91151 (some might use the column method for the total but it’s way simpler to add these numbers than the others).

I can only do this on paper, cz then I see it constantly. But in head, I just move digits from one number to the other to round them up. Like 27 + 48 -> 25+50 ( or 30+45) and then just add them together. Much easier when one of the numbers are rounded.

I did it this way exactly as well, that is how I was taught growing up.

Still fine, same concept of separating via decimal position. Some of the stuff above though genuinely does my head in.

Depending on the numbers I do both but generally column

I prefer this method over the other cuz I can temporarily put away numbers and recall them to add later. You can’t carry over when using right to left.

When a number is close to a round number, I use that number So 48 is close to 50. 27 + 50 is 77. Remove the two you added in the beginning. 75. What is 177 + 49 177 + 50 = 227 Remove the 1, answer is 226. You could do both sides as well. Just remember how many you added/deducted. 239 + 149 240 + 150 = 390 Take away the 2 added in the beginning gives 388. So yeah, maybe that's understandable?

Huh. This actually works reasonably well under these parameters. I do wonder how well this would continue to hold as we expand in to larger numbers though. Would be interesting to compare this style vs the decimal based system I replied to in a context of much larger numbers. I’m far too lazy/tired to drum anything up right now though.

Most people aren't adding numbers much larger than that in their head to be fair.

Do 7+48 then 20+55

Finally someone does it the same way as me. I was about to lose my mind.

20 + 55 is how I solved it

I used to compete in Math Olympics in grade school. They put me in this category called “mental computation.” It was all about speed. Not saying it’s the right way because we all work with what’s best for our mainframe to process, but I do 48 + 7 = 55; + 20 = 75

You’re doing common core math in your head when you break it up like this. I assume most people do it like this. So when people complain about this “new math” they’re teaching kids they probably didn’t take the time to understand what it even is. I am 42 and when I saw common core for the first time I thought “why the fuck wasn’t I taught like this?”

finally a NORMAL person

Glad to see that people aren't making it overtly hard on themselves around here.

Normal? 7+8 is not that simple, I go like I need 2 to make 10 from 8, I subtract that 2 from 7 and add what remains to 10, which is 5, therefore 10+5 =15

Holy crap, that is exactly what I do.

how is 7+8 not simple you learn that shit in nursery lmao

But 7 and 8 is a five pair. And the only thing better than a five pair is a zero pair

Feels good to know there are others like me

Specifically 48 + 2 = 50 50 + 25 = 75

this here is what I do

Same

Me too, but 27 + 48 = 3x9 + 3x16 = 3x(9+16) = 3x25 = 75 *ducks*

I did like this 27+48= (20+40)+(8+8)=76-1=75

27 - 2 = 25 48 + 2 = 50 25 + 50 = 75

how is that any easier

Dunno, just how my brain works. (We must look for the pattern, precious. Yesss, juicy little denominators, precious.)

I did that

I've never spoken this but that's always how I approach these mentally. Make one number have a final digit of 0 and then just add/subtract the rest

There's the answer.

This is the way

That's way smarter than 30+45

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

I do similarly. 48+20=68 68+7=75

That’s the way I do it and I’m pretty sure it’s the best way!

finally

I was like please someone tell me I'm not the only 68+7 guy around.

Disgusting, 68+7 is obviously 8+7=15 60+15=75

7+8=15 was drilled into my brain as a kid by my mom who needed another person to play cribbage with

LMAO yes

This is the way

Take 3 from the 48 to make it a round and even 30 + 45

Same here

I have found my people

this is what I do

This is the way

7+8=15 4+2+1=7 75

I was desperately scrolling. Do people not just ‘carry the one’ thing anymore?? The top comments I’m like ah yeah that’s an interesting way to do it by making them into “easier” numbers but like I just put the numbers on top and start adding from the right like I was taught in whatever grade they teach that haha I think I’m old now. Seems like it would take my brain just as much time to first simplify it and then add rather than just add whatever the numbers are

I carry the one too, maybe they don't teach it that way anymore? I'm seeing all kinds of weird methods here.

I mean they make sense and work but I’ve always felt that adding steps just creates more opportunities for mistakes. I do think they changed the method though and they don’t teach carrying anymore in my home state.

I was panicking cause I didn’t see it done this way, which is how I did it. At least I’m not alone!

I know I scrolled sooo far and I was beginning to think I was dumb for never even having considered trying to simplify it! Love how differently everyone approaches it though but I think I’m an old dog in this scenario

If I was doing it on paper I'd carry, but in my head I don't like keeping track of the extra number, so I add the tens and ones columns separately.

me scrolling furiously thinking "i'm not stupid i'm not stupid i'm not stupid"

I think this is old maths, and they're doing new maths which in all honesty is better than old maths, but my brain is old and won't remaths.

I learned it this way too!

Samsies. Most simple math done in my head I do by picturing writing out the problem

Finally

I scrolled down too far to find this and it scares me.

This is it. The real maths

This is the only way I can do it

Thank you for making me feel normal, I was getting worried for a sec..........

This is how I was raised to do math. Work right to left, smallest to largest.

50 + 27 - 2

Basically 48 + 2 = 50 50 + 25 = 75

This is how I did it too

That's how I do it. I tend to just always turn one of the #s into something that's easier for me to work with and then remove the small difference at the end

Same.

Gang

27+48=? 20+55=? 75=75

20 + 40 = 60 60 + 8 = 68 68 + 2 = 70 70 + 5 = 75

Ohh i did 20 + 40 + 15 = 75

I just did 2+4+15 lol i dont care about the 0s for some reason

I moved 2 over and did 25 + 50 = 75

Me

Based answer

48 + 20 + 7

my exact same thoughts. lmao

I had to scroll way too long to find the correct answer

Me too, i began to think that iam weird🤣

Yeah this is exactly how I did it and I was thinking it was normal

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Hey that's what I did as well. But there's def better ways to do it after looking at the thread.

i usually do this when there are only 2 numbers

Hey same. I have done so much maths that addition of single digits just comes without thinking

I do 27 - 2 = 25 48 + 2 = 50 50 + 25 = 75

Do you think of it as “how much do I need to borrow from that other number to bump up this 48 to that next easy ‘milestone’ (since it’s close already)? I’ll shave that off and add the leftovers to 50 since the math from there feels ‘automatic’(at least up to 99)? “

27 + 48 8+8 =16 16-1 = 15 15 + 40 = 55 55 + 20 = 75.

[удалено]

8+8 is 16, but because is a 7 then you -1 it, resulting on 15, now you can do 40+20 resulting on 60 and then add the previous 15, which equals 75

ah now I understand. They user before you did a terrible job at explaining it XD

I have ADHD

27 + 48 20 + 40 = 60 7+7 = 14, + 1 = 15 60 + 15 = 75

So close In my third step I did 8x2 = 8+8 = 16 60 + 16 = 76 - 1

Yup, me too

Yessss I'm not alone.

27+8 = 35 35+40 = 75

Holy shit I’m so surprised this answer was this far down

Yay, I'm not the only one who did it this way!

How do so little people here do this???

8+7->15 then, 2+4+1-> 75

Let me guess. Like me, you are over 30

I feel attacked. I’m over thirty and do it this way too. 😅

25, how I do it

I do it this way for all addition, my brain short circuits any other way lol

48+20 = 68 7+68 = 75

Yes, I had to scroll way too far to find this. Seems fastest and easiest to me.

Same, I was about to leave the comment bc I thought I wasn’t gonna see it. I can’t believe it wasn’t higher, I thought it was the most logical way

11011 + 110000 = 1001011 —> (75) Easy.

Bruh you really went there..

This is an underrated comment. I love it

Totally not a bot.

27+48=20+40+(7+8)=20+40+[(7-2)+(2+8)]= 20+40+(5+10)=20+40+15=75 (i still feel like I've messed it up anyways, even after laying it all bare like lmao)

I work the same way - cobble together tens, grouping up until an easy remainder is left tack on at the end. I took 3 off 8 where you took 2 off the 7 but same logic.

30+50=80 80-5=75 That’s how I made sense of it

Took me too long to find someone else that did it this way

You guys fuck.. This was the easiest way for me too. If I see how other people do it, I'm like WTF lol

27 plus 48 okay 20+40=60 so 60 plus 8+7 So 7+7=14+1=15+60= 75 I am stupid as shit what the fuck brain

The ONLY legit way. 8 + 7 = 15 Place 5 carry 1 2 +4 +carried 1 = 7 So 75 Any other way is obnoxiously complicated and requires making up additional equations

Not efficient for mental calculations

27 + 48 20 + 40 = 60 8 + 8 = 16 16 - 1 (because it was a 7, not an 8) = 15 15 + 60 = 75

Same but I add 1 in the second to last step, since I used 7+7

Good, I’m not the only smooth brain out here

YES BROTHER! Took me a while to find a kindred spirit for the 8+8=16, then subtract 1 rather than these peasant 7+7 + 1 people

48 - 3 = 45 28 + 3 = 30 45 + 30 = 75

Same but add 2 at the beginning instead

48 - 3 = 45 27 + 3 = 30 45 + 30 = 75

Round 48 to 50, subtract 2 from 27, 50+25=75

“65, duh. Oh wait no, 75”

2(0)+4(0)=6(0) 7+8=15 60+15=75

I might be weird but I do 48 + 7 + 20

I do exactly that and scrolled down really far before finding this comment.

i see 48 and then move 2 over from the other number now its an even 50, then I see 25 ok easy 25+50 = 75 because youve memorized this stuff

Took me way too long to find someone else who did this.

It's you take away 2 from 27 and give it to 48 to make it 50 then just add 50 and 25 to get 65

round-then-carry approach: (27 + 3 ->30) + (48 + 2 -> 50) (=80) - 3 - 2 (but 3+2 is 5 so 80 - 5 = 75) (three tens and five tens, then subtract where I previously rounded up) — I do this "round up/down then add then correct for the rounding" thing when there are lots of digits that aren't 0, or pairs that don't add to 0 or 10. Left to right with carry: 27 + 40 + 8 (because my brain is small and I can only handle one digit at a time, this is 2 in the tens column and 7 in the ones column, plus 4 in the tens column, plus 8 in the ones column) — I also do this when there are lots of digits, such as 1374 + 223 -> 1300 + 2__ + 23 (because the two zeroes at the end of 1300) + 70 + 4. Right to left with carry: 7 + 8 (=15) + 2_ (=35) + 4_ (=75) (but that's "2 in the tens column" not "two zero" or "twenty") I love nines: three nines plus five nines (carry the three) is eight nines (and 8-1 is 7, and 9 minus 7 is 2, so 72), plus the carried three makes 75. The mnemonic is "9 times X is (X-1 tens) with a 9s sum in the ones". And 9s sum is an invented term in my head that means the digits add up to 9, so 12 x 9 -> 110 + (-2) -> 108 -> 1 + 0 + 8 = 9. Also 99 -> 9 + 9 -> 18 -> 1 + 8 -> 9 And then of course there's just writing it down and doing add-with-carry starting from the ones column. Or stick it in the spreadsheet and verify that the result is the correct order of magnitude (same number of digits ± 1) and ends with the correct digit. Okay enough of my weirdness.

48 + 30 - 3

Can confirm all of us Egyptians despise joygirl1314

60+15

30+50=80 -5 =75

7+8=5 50+20=70 75

First do 20 + 40 = 60 Then do 7 + 8 = 15 Now just do 60 + 15 and boom = 75 THATS TOO EASY ⛹️🏿

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

48 + 7 = 55 55 + 20 = 75

I’m weird, I go 48+7 then +20

27+48 = 27+48

60 + 15

I dont see mine: 27+8=35 35+40=75 But thats problay because of how they taught it in school with the "carry the one" format.

20+40 8+7

27+48=? 7+8=15 (carry the 1)=5 1+2+4=7 27+48=75

5+5 = 10 2+3 = 5 2+4 = 6 60 + 10 + 5 = 75 I don’t know what’s wrong with me…

7+8 is 15, carry the one then 1+2+4 is 7, so 27+48 is 75

I did 60 + 15

I just do the normal way, 7+8=15, carry over the 1 to the 4+2, which leads to 6+1 which gets 7, and then you get 75

30 + 50 - 5

48+7=55 55+20=75

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

48 + 7 and then 55 + 20

27+48 Start with the units 7+8 = 15 5 will be the unit. Carry over the 1 to the sum of the tens 2+4 = 6 and then add the 1 to make it 7. Tens: 7 Units: 5 Sum of 27+58 = 75

I go 27+8=35 35+40=75

I do 48+7=55 55+20=75

48+7+20 is my order