I think we can follow this course for the first several lessons. My lessons are numbered with Arabic numerals; Ray’s are numbered with Roman numerals.
Lesson 1 - Lesson XI – work out the table at the top with counters and drill over that, with counters
Lesson 2 – Lesson XI – drill on the word problems, orally
Lesson 3 – Lesson XI – drill on the word problems, orally, but phrase them as arithmetic problems (2+1 instead of using the word problem format)
Lessons 4-6 – Lesson XXV – repeat three steps above
Lessons 7-60 – Repeat this process for each of the next arithmetic lessons, alternating addition and subtraction lessons. Optionally skip the last arithmetic lesson since it works with 10 and the implication from CM is that we would stop at 9.
Lesson 61 – Lesson XXXIX – work out the table at the top with counters and drill over that, with counters
Here I’m at a loss because I’m not sure if we should drill with word problems, as above, or continue straight to addition. Any thoughts are welcome.