How do you get the answer 10 using four fours?

Answer 1

If only Basic Operators are allowed then:

(44-4)/4

If square root is allowed, then:

4/sqrt(4)+4+4

or

4*4-4-sqrt(4)

If factorial is allowed, then you can also:

4!-4/4*sqrt(4)

or

4!/4+sqrt(4)+sqrt(4)

or

4!-4*4-sqrt(4)

etc.