The ratio 7 to 12 is written as 7/12 as a fraction in its simplest form. It is not possible to simplify this fraction any further because 7 and 12 have no common factors.
If both the numerator (top part) and the denominator (bottom part) of a fraction have a common factor, the fraction can be simplified by dividing both the numerator and the denominator by that factor. For example, 6/12 can be reduced to 1/2 by dividing both numerator and denominator by 6. Sometimes, this process can be repeated several times. However, there is no number (other than 1) that can divide into both 7 and 12 to give a whole number, so 7/12 is in its simplest form.