Plus Riddles

Plus vs. Times
Riddle:
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. Now find the answer for 4 numbers and for 5 numbers.
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How Many Pluses
Riddle:
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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