interactive fractions
a1 a2 a3 a4
b1 b2 b3 b4
c1 c2 c3 c4
what fractions look like types of fractions operations 

what fractions look likehalf This is what a quarter looks like. Drag some points.
1/4 2/4=1/2
3/4 4/4=1
Please enable Java for an interactive construction (with Cinderella).