The fraction form is just that - 4/7. You would usually use a horizontal bar to separate the 4 and the 7.
centimetres
a centimeter
a centimeter
A fraction of a Newton is a dyne. It is a unit of force specified in the centimeter gram seconds system of units.
36 is an integer and not a fraction. However, it can be expressed in rational form as 36/1 which cannot be simplified.
centimeter
millimetres.
Assuming you mean a fraction, the answer would be 17/25 use your calculator...
-0.312 is a fraction. It is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. And, being a decimal, there is no simpler form. Its rational equivalent is -312/1000 which can be simplified -39/125. But simplification means that you lose information about the precision of the fraction and end up with a fraction that may be more awkward to use.
While there is no fraction form for pi, 22/7 is an approximation of pi that can be used for a rough calculation .
In the same way that you would use any other ruler except that you use the centimetre scale.