BosGuy brain teaser

Posted on July 5, 2013 | 7 Comments

Each Friday morning I post a riddle to get you to think outside the box and exercise your brain.

If you are stumped, share it with a friend or colleague to see if you can figure it out together.

I’ll confirm answers later in the day so don’t worry if you don’t see your comment posted right away. I want to give everyone a chance.

This weeks riddle: With the numbers 123456789, make them add up to 100. They must stay in the same order. You can use addition, subtraction, multiplication, and division. Remember, they must stay in the same order!

Like riddles? Check out past week’s brain teasers.

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7 responses to “BosGuy brain teaser”

rmaszczak | July 5, 2013 at 5:03 pm | Reply

My mind is whirring out of control!

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Justin James | July 5, 2013 at 1:01 pm | Reply

1+(2+3-4+5+6+7-8)*9 = 100

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matt | July 5, 2013 at 10:16 am | Reply

There are a ton of ways you can do this – here are a few:
1+2+3+4+5+6+7+(8*9)
1+2+3-(4*5)+(6*7)+(8*9)
1+2-(3*4)+(5*6)+7+(8*9)
1+2-(3*4)-5+(6*7)+(8*9)
1+((2*3*4*5)/6)+7+(8*9)
1-2+(3*4*5)+(6*7)+8-9
1-2+(3*4*5)-6+(7*8)-9

If the numbers are allowed to be combined into larger numbers (keeping the same order) then the possibilities increase exponentially. Such as:
123+45-67+8-9

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- BosGuy Blog | July 5, 2013 at 1:02 pm | Reply
  
  I’m math-handicapped so I’m kind of in awe Matt.
  
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  - matt | July 5, 2013 at 8:32 pm |
    
    hahahah I try
    
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dandbear | July 5, 2013 at 10:07 am | Reply

123+45-67+8-9

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joey | July 5, 2013 at 9:02 am | Reply

Probably lots of solutions but I’ll keep it simple and go with:
12 + 3 + 4 + 5 – 6 – 7 + 89

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