Ask yourself: by what number (a fraction) must we multiply 4 to obtain 13/3? Try (13)/(4*3).
Check: Does 13
------- * 4 equal 13/3? Yes.
4(3)
Check again. Does 13 13
--------- * ------- = 14/3 ? No
4(3) 3
Try something different. Convert 4 to 3(4)
-----
3
Then we have 12/3, 13/3, 14/3, 15/3, 16/3 (different numerators, same
denominator)
Continuing, 17/3, 18/3, 19/3, and so on.