History problems

At home they always told me that history and mathematics were the most important subjects in education. When I was young, they gave me the 9 heavy volumes in the history of England, of Hume and promised me all the things that were promised to the children of that time such as Ponys, guns, or anything else nineteenth, in order to incite me to dedicate myself to dedicate My energy to study me those books.

If you examine me of ancient history, you would realize that what I do not know, exceeds, twice the size of a normal library. But some of the things I discovered about those heavy volumes are worthy of mention. For example, I discovered that arranging the volumes on two shelves, as you see in the drawing, the fraction equals . It is possible to find other provisions, using the nine volumes, which according to fractions equivalent to .

This riddle is very simple and will familiarize the little ones with the peculiarities of the figures. In addition, it is an excellent school that gives rise to endless numbers games, since you can continue playing indefinitely and create new problems.