Common Core standards for kindergarten through 3 rd grade math also require students to demonstrate a greater ... students were learning about addition during a class at the start of the school year.

Sean Nank is a math expert who is helping teachers to implement the Common Core ... For example, with 7+13, you want to be able to see the tens and ones. 10 + 3 is 13; 3 + 7 is another set of 10 and ...