These drills are sort of the same as flash cards with the computer as your partner. The computer will show you all the problems one at a time. You enter your answer and the computer tells you if it is right, and if it is wrong you are shown the correct answer. When you are ready to go to the next problem hit enter again. A running total of correct answers is kept at the top of the page. To reset the running total hit reload on your browser. The running total automatically resets after you complete the full set of problems.