Have used this for about 4 years with my 2nd graders.
Daily practice strips, which we go over together in class when their time is up, except for Fridays. On Friday, there are more questions and longer time and that is used as their assessment to see if they know that fact.
It doesn't have to be in class assessment, though. It can be used for homeschoolers, summer practice, an independent center, and more.