These worksheets are a real life-saver!! Through many years of teaching experience … I know that repetition is the key to memorization! I started giving out these worksheets and having my kids do only one row a day. As time wore on, we eventually worked up to doing an entire worksheet a day. I have used the simple addition/subtraction, three digit add/sub, multiplication and division worksheets. All of them are fabulous and such an easy way to drill basic math knowledge into memorization . I have one son that struggles with severe ADHD and I love the sheets because they have helped him memorize the facts rather than use his fingers. I would highly recommend these worksheets to anyone that is looking for an easy way to help drill math memorization facts for future success.