3/2 * 4/9 = (3*4) / (2*9) = (se simplifica prin 3, apoi prin 2) = 2/3.
1/14 * 7/5 = (1*7) / (14*5) = 1/10.
15/3 * 6/7 = (15*6) / (3*7) = 30/7.
5/7 * 42/15 = 6/3 = 2.
Un intreg si 5/8 = (1*8+5) / 8 = 13/8, rezulta: 13/8 * 42/15 = (13*7) / (4*5) = 91/20.
9/7 * 3/5 = 27/35.