# 27+48

tailwindhome
Posts:

**18,244**
There's an interesting 'thing' going round on twitter

27 plus 48 is 75

But what's your thought process to get to the answer

Post your answer below (before you read everyone else's)

It's interesting how people process this differently

27 plus 48 is 75

But what's your thought process to get to the answer

Post your answer below (before you read everyone else's)

It's interesting how people process this differently

“New York has the haircuts, London has the trousers, but Belfast has the reason!

0

## Posts

18,24440+20 = 60

7+8 = 15

60+15 = 75

10,83268 + 7 = 75

Marin Palisades Trail 91 and 06

Scott CR1 SL 12

Cannondale Synapse Adventure 15 & 16 Di2

Scott Foil 18

5,7037+8 = 15

60+15 = 75

35,452This originally but it may have been because I saw your answer before thinking about it. I went back to it and did 27 + 50 then took off 2.

1,363Simple

22,354I find the way these things are done by children these days strange. Different methods, but the same results.

I am not sure. You have no chance.

2,36827-2 =25

25+50 = 75...

or am I missing something obvious here

18,244There's no trick and nothing you're missing.

It's just interesting that people have different thought processes to get the same answer.

13,932Well, no. Did anyone else learn to use those 'calculating machines' where you turned a handle round numbers of times for multiplication? In a maths lesson, before we were allowed to have the fun of using them, we had to do mental calculation to get ballpark figures, because of the risk of jiggling the thing along too far and getting out by factors of something.

Anyway, O-levels done without calculators, but with log tables and slide rules (modern school children don't know what these are).

And the answer to the question... not quite sure, TBH - I think a sort of mixture, dumping the smaller number on top of the bigger one. Calculating VAT at 17.5% in one's head was always fun.

24,657Seven and eight is fifteen, carry the ten; two and four is six and one is seven: seventy-five.

Be interesting to try it with two three-digit numbers.

Pinnacle Monzonite

Part of the anti-growth coalition

2,368some have very complicated thought processes by the looks of it

22,354I am not sure. You have no chance.

9,680If I had to help someone figure it out I would probably tell them to work out 30+48 and then knock off the three difference between 27 and 30. Or similar with 27+50...

Bikes: Donhou DSS4 Custom | Condor Italia RC | Gios Megalite | Dolan Preffisio | Giant Bowery '76

Instagram: https://www.instagram.com/ben_h_ppcc/

Flickr: https://www.flickr.com/photos/[email protected]/

18,244Yeah. I gave the answer as I wanted it to be clear it wasn't a 'trick question' but should have left that out as it maybe skews your natural thought process.

35,452Must be a Civil Engineer thing as I did similar but added on 50 and took off 2.

8,35066,270Lives HereWeird i know. I tend to see the differences between round numbers.

8877+48 = 55

55+20 =75

Not sure why but I always seem to do things that way, get the smaller number to a round and then the rest is easy.

9,680Must be!

Bikes: Donhou DSS4 Custom | Condor Italia RC | Gios Megalite | Dolan Preffisio | Giant Bowery '76

Instagram: https://www.instagram.com/ben_h_ppcc/

Flickr: https://www.flickr.com/photos/[email protected]/

24,657My two primary school age children have been taught "number bonds" - memorising pairs of numbers that sum to each of the integers from 2 to 20, in much the same way as times tables. Possibly you have memorised that 27 + 48 = 75 through repetition, without realising it.

Pinnacle Monzonite

Part of the anti-growth coalition

9,680It's highly likely. I can't remember to buy milk, but remember various numbers without any issue.

Bikes: Donhou DSS4 Custom | Condor Italia RC | Gios Megalite | Dolan Preffisio | Giant Bowery '76

Instagram: https://www.instagram.com/ben_h_ppcc/

Flickr: https://www.flickr.com/photos/[email protected]/

66,270Lives HereThis is certainly how I see it.

I end up half visualising them as shapes that tessellate. 2s match with 8s, 7s with 3s etc.

7,12920+40=60

8+7=15

60+15=75

Columnar addition in my head I suppose.

9,680This is the driver for how I said I would help someone figure it out. I certainly do this for larger numbers, but as rjsterry suggested... I work with numbers every day - down to mm and 3dp - so I think I simply memorise certain sums, subtractions and multiplications.

Interesting thread, thanks to TWH for starting it off!

Bikes: Donhou DSS4 Custom | Condor Italia RC | Gios Megalite | Dolan Preffisio | Giant Bowery '76

Instagram: https://www.instagram.com/ben_h_ppcc/

Flickr: https://www.flickr.com/photos/[email protected]/

66,270Lives Here25350+27=77

77-2 (the rounding difference).

Not very elegant.

24,657Repetition, innit. Darts players are very good at adding doubles and triples of 1-20, and subtracting these from 501.

Pinnacle Monzonite

Part of the anti-growth coalition

6,726Upon looking immediately the first thing my brain sees the 7 and 8 and knows that's 15, the rest comes after that.

7+8 =15

40+20 = 60

...75

But strangely, I looked at it and immediately thought 75 and all this that followed was just a double check.

48,5362,696