Hi, Tedi. My name is Rachel.

There is a lot of review in Level C for more advanced addition and subtraction. Level C will teach the student various strategies to help him get to the correct answers more quickly.

As you have discovered, higher level addition/subtraction is more complicated and requires more time for many students to master. This is why there is more time put in those concepts.

Yes. You want your student to master addition/subtraction facts to 20. Level C will build upon those concepts and have the student work more complex addition and subtraction work. So, if your son is doing well with his math facts, he will be fine in Level C. Level B provides solid instruction, Level C will continue in that instruction and provide more complex problems for the student to consider and work through.

I hope that helps! If you have any further questions, please do not hesitate to repost here or email RightStart Math directly at info@rightstartmath.com.

Have a great summer!
Rachel