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Being proficient in dealing with numbers
Is 90% advance or proficient
The abstract noun form of the adjective 'proficient' is proficiency.
Very important!
The answer to the question depends on the set of numbers within which you are working. If you are working in integers, x2 = 2.25 has no solution. However, it does have a solution in rational numbers (x = 1.5). If working with rationals, x2 = 6 has no rational solution but it does have a solution in real numbers. Yet again, x2 = -6 has no solution in the reals, but does have a solution in complex numbers.