The Hindus invented the numeral system; the Babylonians and others had invented the decimal system; the Greeks came up with what we would call algebraic equations for solving complex arithmetic problems, (but didn't they didn't call it that); the Nestorians translated much of the Greek works into arabic; etc.
The only thing I can tell you about true muslim involvement in math is: they coined the name for this branch of math “Algebra”, and one of their ilk experimented with making it a purely hypothetical exercise, as opposed to actual problem-solving.
Thanks