В: 3/5 · 5/9; 6/7 · 2/3; 5/6 : 1/2; 3/7 : 14; 5/12 : 1/6. 5 · 10/11; 2/5 · 15/16; 3/14 : 2/7; 4/5 · 5/6; 7/8 : 14. 2/3 · 1/4; 2/15 : 1/7; 8 · 3/4; 1/6 : 2/3; 4/7 : 8.

При делении на дробь умножаем на обратную дробь.

1. 3/5 · 5/9 = 1/3; 6/7 · 2/3 = 4/7; 5/6 : 1/2 = 5/3; 3/7 : 14 = 3/98; 5/12 : 1/6 = 5/2.
2. 5 · 10/11 = 50/11; 2/5 · 15/16 = 3/8; 3/14 : 2/7 = 3/4; 4/5 · 5/6 = 2/3; 7/8 : 14 = 1/16.
3. 2/3 · 1/4 = 1/6; 2/15 : 1/7 = 14/15; 8 · 3/4 = 6; 1/6 : 2/3 = 1/4; 4/7 : 8 = 1/14.