What is 12/30 as a percentage? It equals 40.00%. This simple ratio shows that 12 parts out of 30 make up just under half of the whole.
The fraction 12/30 can be reduced to 2/5, which is easier to work with in many situations. Seeing it as a part of a whole helps when comparing quantities or measuring portions.
In everyday life, a 40.00% share might represent a discount, a test score, or the portion of a project completed. Knowing the percentage lets you quickly understand the size of the part relative to the whole.