I was reading an online article and found this:
MATH: On average, students lose approximately 2.6 months of grade level equivalency in mathematical computation skills over the summer months. Studies reveal that the greatest areas of summer loss for all students, regardless of socioeconomic status, are in factual or procedural knowledge (Cooper, 1996).
So, if your child is leaving grade 1 at a 2.0 (grade 2) level, without daily home reading and math they will start grade 2 behind (at approximately 1.7. That is where they were in about March of Grade 1).
If you need some help with resources for the summer please contact me and I will be happy to help. Walmart has some excellent activity books that are well priced.
READING: ...Children are ready to shrug off the mantle of "student" for the two-month break, along with the backpacks, the math homework, and the quizzes and tests. But just because school is out, it doesn't mean that reading and learning should stop. Teachers know that many children can't afford to take such a long break. Young readers who don't continue to read over the summer — especially those who are reluctant or at-risk — are likely to lose crucial ground. One summer off can sometimes mean a whole school year of struggling academic performance.
It is important to read as well as work on basic addition and math facts daily. Giving them problems and having them figure them out will also keep their minds sharp and enhance skills that will be needed in grade 2.
There are many articles on this topic on the internet...education journals are the best place to find accurate facts on this topic.