An article by Elizabeth Green (CEO of a nonprofit education news organization called Chalkbeat) that recently appeared in the New York Times magazine, attempts to explain why most Americans are bad at ...

A teacher has 21 red pens. If the ratio of red pens to blue pens she owned was 3:1, how many pens did she have total? It’s one of the word problems sixth-graders at Vera C. O’Leary Middle School were ...