It appears that math is something that parents don't feel as comfortable doing with their kids, we find that math is often something that parents view as the school's domain to instruct students on. So typically, when school is out, math just happens less in the home than reading.

Megan Kuhfeld

We do want to caution that the fact that we're not seeing very big differences right now could underestimate the gaps that may be forming for the students who are fully disengaged from school and missing from our data.

It's kind of a double whammy of starting to forget and losing that kind of academic mindset of being out of school, and missing out on a couple of important months of instruction, come fall... teachers may have students in their classrooms who are grade levels apart in their learning.