(2/11)+(5/11)
(2/10)+(3/10)
(3/11)-(5/11)
(1/10)-(9/10)
(4/3)-(3/2)
(2/3)x(3/5)
(2/3)/(5/4)
(1/2)x(5/2)
(1/10) x 10
