Elementary math teachers, you may be interested. Key points from an article in today's Wall St. Journal (my summary) that I thought were interesting: National tests show nearly half of 8th graders aren't able to put three fractions in order by size. Building a conceptual understanding of fractions in 3rd and 4th grades much more valuable than rote learning of rules. Teaching fractions with a number line is more valuable than using circle graphs/pieces, particularly for division of fractions. Knowing how to place fractions on a number line is a better predictor of kids' fourth-grade fraction skills than calculation ability, working memory or the ability to pay attention (per a recent study of 357 kids by Nancy Jordan of Univ of Delaware). A child's knowledge of fractions in 5th grade predicts performance in high-school math, even after controlling for IQ, reading ability, working memory, family income and education, and knowledge of whole numbers (per a 2012 study of 4,276 students led by Bob Siegler at Carnegie Mellon Univ). Battleship Numberline on BrainPop (game) has helped students understand fraction concepts. One banana plus one banana is two bananas. One apple plus one apple is two apples. But, one apple plus one banana is not two banapples. Neat description to use in discussing addition of fractions with different denominators.