These math drill worksheets differ from the other basic math worksheets in that there are many more problems on the page due to a smaller font size and removal of the problem numbers. The math drills are designed to be time-limited so that it is not practical to finish all of the problems on the sheet. The score is determine by how many correct answers the student can finish in the allotted time, such as one minute. We can speak from experience when we say that having students do this exercise on a daily basis results in dramatically higher basic math skills.