Learning Resources DoubleSided Magnetic Demonstration Rainbow Fraction Circles. Demonstrate fractions, percentages and equivalencies with these unique magnets, perfectly sized to be displayed front of class on a whiteboard. Teach the fraction then flip over the magnet to show the corresponding percentage a great way for young learners to understand the relationship between the concepts. Includes nine 18cm circles (whole, , 1/3, , 1/5, 1/6, 1/8, 1/10 and 1/12) and Activity Guide. Suitable for ages 6+