a) 12/5 · 7/18 =(12 ·7) / ( 5·18) = 14 /15 → se simplifica cu 12 cu 18 prin 6 = 2/3
b) 3/8 · 5/6 = (3 ·5) / ( 8 · 6) = 5 / ( 8·2) = 5/16 → simplific cu 3
c) 9/7 · 2/3 = (9 ·2) / ( 7·3) = (3·2) /7 = 6/7
d) (8·7) / ( 5·12) = (2·7) / ( 5·3) = 14 /15 → am simplificat cu 2
e) (4·3) / ( 5·6) = 2/5 → am simplificat cu 6
f) (21·5) / (4·14) = (3·5) / (4·2) = 15/8 = 1 intreg si 1/8
g) (35 ·4)/ ( 8·21) = 5/ (2·3) = 5/6 → am simplificat cu 28 (7·4)
h) ( 49 · 18) / ( 24 ·35) = (7·3) / ( 4·5) = 21/20 = 1 intreg si 1/20
→ am simplificat prin 7 si 3
i) (14· 18) / ( 27·49) = ( 2·2)/ ( 3·7) = 4/21
→ am simplificat cu 7 si cu 9
