Book 3 is moving along in the publication process and we hope to have it available the first half of this year.
I have some ideas on what you can do with your student while you wait for the release of Book 3. You can repeat the same steps as you used for Larger Addition in the hundreds using a dollar in Book 2, but introduce one thousand with a ten-dollar bill (exchanging it for ten one-dollar bills) and progress to doing Larger Addition in the thousands and then Large Subtraction too. That’s where Book 3 begins.
Another option would be to simply continue the multiplication tables for 7 through 10, using the same techniques outlined in Book 2. Those will be covered later in Book 3, but that section can easily be done out of order and then just skip/review that portion when the book comes out. I hope this will help you as you continue using Charlotte’s method.