Braingle: '1 2 3 4 5 6 7 8 9 = 100' Brain Teaser

1 2 3 4 5 6 7 8 9 = 100

Math brain teasers require computations to solve.

Puzzle ID:	#376
Fun:	(2.67)
Difficulty:	(2.18)
Category:	Math
Submitted By:	Mr. G
Corrected By:	CinnamonBaby123

Can you place + and - signs between the following numerals to make the equation true? You can only use a total of 3 symbols and you cannot rearrange the numerals.
1 2 3 4 5 6 7 8 9 = 100

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Comments

Shorty12 Feb 03, 2005	FUN!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Sane Mar 16, 2005	That was actually pretty tricky.
dutchymonster Sep 02, 2005	the hint made it a lot easier, but still pretty tricky. fun though
Shawnheyhey123 Dec 09, 2005	I had a different way of doing it. I thought it was a trick and you could change the + to an x by turning it on it's side and do: 1+2+3+4+5x6-7+8+9=100
horse_luver Jan 22, 2006	I recently had a challenge in this regard... come up with as many solutions as possible, except you can use x , / and brackets as well. I got 21. Anyway, this teaser is a really interesting variation! fun!
thompson1 Mar 14, 2006	Actually, Shawn, you couldn't do that because it says you can only use 3 symbols.
jj_is_cool Mar 29, 2006	shawn is my brother, i wish
Vigo95 Mar 29, 2006	why are you trying so hard to make me think ?!! i will not do it !!!
calmsavior May 03, 2006	Shawneyheyhey123 is wrong. you can only use three symbols!
flowerz2010 Aug 24, 2006	got it with the hint
slicktrumpet Apr 10, 2007	Very clever!
javaguru Jan 16, 2009	Got it in less than thirty seconds without the hint. Since only three symbols could be use either two, three or four of the numbers needed to be relatively close in value. There wasn't any way to make two 4-digit, or a 4-digit and 3-digit number, or two 3-digit numbers that were close, so it had to be one 3-digit number and three 2-digit numbers. The 3-digit number had to be 123, which left 45, 67 & 89. The 23 from 123 had to go with 89, so 45 and 67 had to be the negatives and 123 and 89 the positives. No trial and error, just wrote out the solution. Piece-o-cake!