Elementary school score multiplication problem,

Elementary school score multiplication problem,

1 question. (3 / 4) * (7 / 9)=
2 questions. (3 / 5) * (5 / 6)=
3 questions. (3 / 7) * (4 / 5)=
4 questions. (13 / 12) * (25 / 26)=
5 questions. (7 / 8) * (14 / 15)=
Five questions a day!
The answers are as follows: 1: 7 / 12.2: 1 / 2.3: 12 / 35 4: 25 / 24.5: 15 / 16