Then, based on the mechanics, I decide how high of an A or B etc. I put the number grade at the top. Then at the end of each 9 weeks I just thumb through the notebook, add up the grades and divide by the number of grades given. That is their Science grade. I don't do Science or History tests yet, may do some one day.
Projects get a test grade though.
You could count memorizations as tests. If they have 30 math problems, for example, each one counts 3 points. Then, based on the mechanics, I decide how high of an A or B etc. I put the number grade at the top. Then at the end of each 9 weeks I just thumb through the notebook, add up the grades and divide by the number of grades given.