reading and math

We worked like mad dogs all morning. I met with all four reading groups and even the little strugglers sounded more fluent and read with expression. I was so proud of them. Then after lunch we had a basic lesson on calendar skills and when I asked how many days there were in a week; all I got was blank looks in return. Then I asked if they knew how many months were in one year, and someone answered "two." OMG! Have these kids been hiding under a rock or what, I feel that is basic information that you learn or should learn in kindergarten. I was shocked that this group of smart kids could not come up with the correct answer or maybe they were just pulling my leg?