Add the following rational numbers

- Add the following rational numbers class 7
- Add the following rational numbers class 8
- Add the following rational numbers 3 7 and 5 7
- Add the following rational numbers 3 4 and 3 5
- Add the following rational numbers and 3 7
- Add the following rational numbers 2 5 and 4 5
- Add the following rational numbers 12 7 and 3 7
- Add the following rational numbers and 3 5
- Add the following rational numbers 3 7 and 2 7
- Add the following rational numbers 2 5 and 3 4
- Add the following rational numbers 5/8 and-7/12
- Add the following rational numbers 5/36 and-7/12
- Add the following rational numbers 15 4 and 7 4
- Add the following rational numbers and 2 7
- Add the following rational numbers 3 7 and 6 7