I use these pages in my classroom as a competitive drill. The children start with the 0's addition facts page. I set the timer for three minutes. If they can complete the page in three minutes, they are allowed to move to the 1's drill page on the next day. If they do not finish, they work on that page again the next day. Each child works through their addition facts to mastery at his/her own pace. The pages go from 0 facts to 10 with sums to 18. It also includes a doubles page.