Summer learning loss in mathematics is a huge problem. Students on average lose 2.6 months of math knowledge over the summer. This means that teachers must take that 2.6 month to reteach that material and still get through the standards required for the current grade. This widens the achievement gap especially with low-income kids, but it does just affect them, all students are susceptible to losing math skills. Many parents, and their children, don't think about math as existing outside of the classroom.
What can we do to change that?
