What is the largest number by multiplying any three individual numbers from -2, 1, 3, -8, 5, 9, -9, 4, 7, -7, and 8?

Question

1 2 3 4 5 6 7 8 9 = 100
Challenge:
Place + and - math symbols between the numbers above to make the equation true.
Use + and - a total of three times.
Do not rearrange the numbers.

Answer 1

648

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-8*9*(-9)= 648 is the largest possible number