A customer asked me about reviewing addition/subtraction facts from 1st grade. The child is currently in 2nd grade but those facts continue to be a weak point, despite flash cards, daily drills on paper, and online drills in the past. Here's my answer... Check out these videos , which show you how the addition facts are taught in MM grade 1. Subtraction facts don't need memorized separately. If you know that 5 + 4 = 9, from that you also know that 9 - 4 = 5 and 9 - 5 = 4. So, subtraction facts become "missing number" addition problems. For example, 7 - 3 = ? Think: which addition fact is this one: 3 + ___ = 7? You can most likely make worksheets for her based on those videos. Additionally, we offer FREE ONLINE practice for addition facts here , and using the fact families approach here . And if you'd like actual books, check out these: www.mathmammoth.com/addition_1.php www.mathmammoth.com/subtraction_1.php Hope this helps!