Learn together with your child. Use this in chapter 1 for the 8x8 square. And in chapter 6 for the graphing. A 6 year old and a 13 year old can do lots of what's in Don's books. Give them a head start.
Every child is different.
See Don's page which shows the mathematics and arithmetic you child will work on . See sample problems and answers from Don's worksheet book. Debbie, a teacher in Keokuk IA, back about 6 years ago, worked with 6-8th graders in my worksheet book. She did something I wouldn't do, but it worked for her. Every child worked on chapter 1 for about 4 months.