Review on Channies Problem Workbook Prek 1st Repetition: Enhance Learning and Retention by Peris Auditore

I bought this for my son who is a kindergarten teacher. During the week he solves problems here and there. There are problems both front and rear. The further we go through the sheets, the more difficult they become. They start adding and then add while subtracting. We'll just rip the page out and I'll let him work on it as he pleases. It's great for the price. Highly recommended for extra math practice.