How do you turn 8888 to 89 using math?

Answer 1

-- Subtract 8,799 from it, or

-- Divide it by 100 and then add 0.12 to the quotient, or

-- Add 12 to it and then multiply the sum by 0.01, or

-- Add -8,887.98 to it and then multiply the sum by 4,450 .

And there are several more ways to do it.