Lisa @ School Family writes: Hi Georgie - asked a 4th grade teacher this question and the following is her reply: She said that in her class there would be at the very least 9 math quiz grades (one a week) and at least three math unit test grades. Some of the reading grades would reflect end of the book tests, reports and reading projects in the 9 week period of time. Hard to pin it down to a specific number, but it sounds like a fair amount of grades should accumulate in that period of time. Keep in mind that every teacher, school and state is different.