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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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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A girl is twice as old as her brother and half as old as her father. In 50 years, her brother will be half as old as his father. How old is the daughter now?
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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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