In Math, Grade 4 students learnt expressing a mixed number as an improper fraction. Students were able to express a mixed number as an improper fraction through reversion process. Teachers re-explained the process of converting a mixed number into an improper fraction. In order to do that, students created a diagram of a mixed number correctly. The next step was to break down the diagram into symbol and operation way. Teachers conducted some practice through class discussion so that students got a strong basic skill of symbol and operation.