Brain Teasers
1999
The year 1999 is special. Using the numbers 1, 9, 9 and 9, in that order, make the number 89. You may use brackets and any standard maths operation such as the square root, +, -, * and /. For example, 26 = -1 + 9 + 9 + 9.
Answer
89 = -1 + 9 + (9 * 9).Hide Answer Show Answer
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Comments
Why not -1-9+99
very easy, but creative...
WAY TO EASY! (Liked it anyway though)
That was pretty good.
that was good
Feb 25, 2006
Another simple solution is 1*9*9+9.
This equals 90.
I got something different-- -1 (negative 1) -1+(9*9)+9=89
9+9=81 so -1+(81)=80 so 80+9=89, which was what you wanted to get (correct me if I'm wrong)
9+9=81 so -1+(81)=80 so 80+9=89, which was what you wanted to get (correct me if I'm wrong)
never mind about what I said, it's just the same thing but backwards, ignore that message lol, sorry
-1+99-9
Oh, just noticed someone else figured that out too!
Mar 09, 2006
Why not 9*9-1+9=89
9*9=81
81-1=80
80+9=89
9*9=81
81-1=80
80+9=89
Far too simple, with many possibilities. Good for the brain, though!
As if it wasn'y already way too easy, you practically gave the answer in your example.
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