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Simple Addition

Trick brain teasers appear difficult at first, but they have a trick that makes them really easy.


Puzzle ID:#4056
Fun:*** (2.84)
Difficulty:** (1.89)
Submitted By:webbtrump***
Corrected By:MellowWillow




5 + 5 + 5 = 550

Add ONE STRAIGHT LINE to the above to make the sum correct.


5 4 5 + 5 = 550

Add a straight line to the first "+" to make it a "4".


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May 15, 2002

or you could just draw a line through the '=' to make it 'not equals' (cop out answer, i know)
May 15, 2002

or ad a straight diagnal line on the "=" to make it not equal...
May 15, 2002

I'm sorry... I didn't see that someone had figured that out already...
May 15, 2002

no worries, i only posted that comment about 20 minutes ago!
May 15, 2002

one of my friends pointed that other solution out. that kinda makes it too easy! sigh. oh well...
May 22, 2002

way too easy, you should consider making it harder
May 22, 2002

No, I don't want to.
Oct 15, 2008

i got the same answer as bluetwo! nice job with the teaser! you fooled me!
Jun 18, 2010

Heard that one before.
Feb 23, 2011

This Teaser worked the proper way on my mind, at the time. I failed to really look at the equation and started to concoct fancy ways of figuring out this simple and very simple addition problem.

Good Work.
Feb 23, 2011

Good Teaser! Clever - I'm going to show that one to my grandchildren. I finally found one I won't have to call Auntiesis and have her explain to me.
Feb 23, 2011

i'm a rebel...i added the straight line to the SECOND +....remember, my way is ALWAYS the RIGHT way
Feb 23, 2011

Good one!
Feb 23, 2011

Gayle, you can call me any time. Tough puzzle, but fun.
Feb 23, 2011

This teaser was challenging in the process, but once you finally click on the answer it's like ohhhhhh! At first I didn't understand the question... maybe that should be corrected...
(user deleted)
Feb 23, 2011

i also added a line throught the equal sign to make it not equals, oh well i guess i didn't think enough
Feb 24, 2011

ALTERNATE ANSWER: Place the single straight line as a left slant directly over the equals sign to form the inequality: 5 + 5 + 5 "is less than" 550 (I cannot insert the symbol correctly in this comment)
Feb 24, 2011

I also added a slanted straight line through the = sign to mean "not equal to" - good teaser.
Feb 11, 2012

Haha I added the line through "=" because 5+5+5 "is not equal to" 550
Jun 15, 2012

WOW... everyone got the same answer as me. slant line thro =... really it could be either. I though i was the only one who would get that.
Feb 23, 2014

The plus sign is so small a line through it hardly shows up to be a 4.
Feb 23, 2014

"Limited edition, let's do some simple addition"
Feb 23, 2014

I went with the "not equal" solution as well.
Feb 23, 2014

Very easy, because I've seen this countless times. Time for some new material.
Feb 23, 2014

You could do the same to the second +, that's how I did it.
Feb 23, 2014

I initially thought of the =thing as well, but I noticed that it said "to make the sum correct." A not-equal sign makes it accurate, but not correct. A little more thinking got me the right answer.
Feb 23, 2017

Cute bug, if you are around somewhere, thanks for yesterday's wish for both of us. However, I have my doubts about myself as I just turned 94 on the 17th. I wish many years ahead for you though. That was so nice of you.
Feb 23, 2017

That was confusing. It should be a replacement not an add.
Feb 26, 2017

I think it's only easy if you've seen it before - or if you happen to see it immediately; which few do! It's clever and fun.
I DON'T agree about the ≠ sign - inequalities are not normally called 'sums'. The instruction requires making the sum correct.

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