What is the fewest number of pluses and minuses you need to do this?

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Presentation transcript:

What is the fewest number of pluses and minuses you need to do this? Mathematics Puzzle 1 2 3 4 5 6 7 8 9 - + Take the digits 1,2,3 up to 9 in numerical order and put either a plus sign or a minus sign or neither between the digits to make a sum that adds up to 100. What is the fewest number of pluses and minuses you need to do this?

Mathematics Puzzle 1 2 3 4 5 6 7 8 9 - + Example: 1 + 2 + 34 - 5 + 67 - 8 + 9 = 100 I used 4 pluses and 2 minuses. (Total of 6 signs)

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