In drawing models for fractions, we need to emphasize the importance of the "same whole" when they are used for instruction on fraction comparison, addition and subtraction. Care must be taken to present them correctly, otherwise it will only add confusion to our students. This concept of the "same whole" in fractions, along with that of "equal parts", are both fundamental in helping students understand the meaning of fractions.
Addition and subtraction of like fractions is the first step in the introduction of the big topic of fraction arithmetic, and is a great chance for teachers and parents to set things right and lay down the right foundation for the future. At the same time, it is an opportunity for students to exercise their deduction and reasoning skills by coming up with the "rules" for adding and subtracting fractions through hands on observations.
Fraction Wheel App is an interactive education webapp to help teachers and parents teach concepts in fractions. The wheel position snaps to fractions whose denominators are indicated by the user. The value of the fraction is shown at the center and can be turned on and off by clicking the center of the wheel.