These are flash cards to practice your fact families. It does not include 1's, 0's, or 10's. When you eliminate those it leaves you with just 36 addition subtraction fact families to learn. There are large triangles. (four to a page) that take 9 pages to copy. There are smaller triangles where all 36 fit on just 2 pages. I run the smaller ones on card stock for the students. Thanks for taking the time to look at this product.