To estimate the gross enrollment of any particular sector of the education, the ratio of total allotted students and people related to the age groups needs to be calculated.
Like in context to India : Ratio of primary education gross enrollment = total enrolled students in primary education / children of the age group 6-11
In 1951, gross enrollment ratio was 43%, which is more than 100% at present. The thing to consider is that how can it be 100%, which is actually true. The reason is that in our country, the children above the age group of 6-11, also get enrolled into the primary education.