(setq x 10)
(setq y 17)
(print (+ x y)) ; 27
(print (- x y)) ; -7
(print (* x y)) ; 170
(print (/ x y)) ; 10/17
(print (type-of (/ x y))) ; RATIO
(print (* 35 (/ x y))) ; 350/17
(print (* 34 (/ x y))) ; 20
(print (type-of (* 34 (/ x y)))) ; (INTEGER 0 281474976710655)