math
posted by poo .
For example,
1 + 2 + 3 + – 4 + 5 + 6 + 78 + 9 = 100
Can you obtain a total of 100 using fewer plus or minus signs than in the given example?

You could get rid of the + in front of 4. It would not change a thing.

1 1 + 2 + 3 + 4 + 5 + 6 + 7 + (8X9) = 100
2 (1X2)  3  4  5 + (6x7) + (8X9) = 100
3 1 + (2X3) + (4x5)  6 + 7 + (8x9) = 100
4 (1 + 2  3  4)x(5  6  7  8  9) = 100
5 (1 +(2x3) + 4 + 5 + 67 + 8 + 9 = 100
6 (1X2) + 34 + 56 + 7  8 + 9 = 100
7 12+ 3  4 + 5 + 67 + 8 + 9 = 100
8 123 4  5  6  7 + 8  9 = 100
9 123 + 4  3 + 67  8  9 = 100
10 123 + 45  67 + 8  9 = 100
11 123  45  67 + 89 = 100 WOW
You might also be surprised to see that it can be done in the reverse also.
1 98  76 + 54 + 3 + 21 = 100
2 9  8 + 76 + 54  32 + 1 = 100
3 9  8 + 7 + 65  4 + 32  1 = 100
4 9  8 + 76  5 + 4 + 3 + 21 = 100
5 98  7  6  5  4 + 3 + 21 = 100
6 9 + 8 + 76 + 5 + 4  3 + 2  1 = 100
7 9 + 8 + 76 + 5  4 + 3 + 2 + 1 = 100
8 98 + 7 + 6  5  4  3 + 2  1 = 100
9 98 + 7  6 + 5  4  3 + 2 + 1 = 100
10 98 + 7  6 + 5  4 + 3  2  1 = 100 To name a few. 
No it's the other way around Get it?
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