Math Riddles

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How can you insert the numbers 1-9 inclusive each only, into the calculation to arrive at the answer 100? ( – ) + + – – – = 100

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My age today is three times what it will be three years from now minus three times what my age was three years ago. How old am I?

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How many pluses should we put between the digits of 987,654,321 to get a total of 99, and where?

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Given two 2s, “plus” can be changed to “times” without changing the results: 2 + 2= 2 x 2. The solution with three numbers is easy too: 1 + 2 + 3= 1 x 2 x 3. What is the answer for 4 numbers and for 5 numbers?

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An officer wishing to arrange his men in a solid square found by his first arrangement that he had 39 men left over. He then started increasing the number of men on a side by one, but found that 50 additional men would be needed to complete a new square. How many men did the officer have?

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This number added to it’s square, and the digits of that summation added together, bring it back to itself. What is it?

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