Pre-Highschool (6th to 8th)
Once you know:
i) the addition tables (What's 5 + 8?)
ii) the subtraction tables (What's 8 - 5?)
iii) the multiplication tables (What's 7 times 8?)
iv) long division (What's 6231 divided by 93?)
...you are ready to start Life of Fred Fractions, the first book in the Pre-Algebra series. These books go far beyond the basic information listed as their title so you probably do need it even if you have already learned a bit about the topic. The Pre-Algebra Series are written at a 7th to 9th Grade level but can be used with a student as young as 4th grade who meets the requirements listed above and has finished the Intermediate Set.