Using four fours how can you get 55?

Negative Minus Negative = Positive so -4-4= 4 ericrain- No... We have to use 4 fours not 2 fours, so 4+4(4-4)

(4! - sqrt(4)) / .4 = (24-2)/.4 = 22/.4 = 55

4 /5

4 times 4 minus 4 minus square root of 4.

(4x4)-(4+4sqr) (4x4)=16 (4+4sqr)=6 16-6=10