I came across this idea on Pinterest and immediately recreated something similar for my own use. I give my daughter a drill worksheet in a page protector with a dry erase marker. She fills in the left hand column with the number she is drilling. We mix up numbers 1 - 12 on the right. We set the timer, and she has one minute to complete the multiplication problems on the sheet. If she doesn't complete it in a minute, we start over. This has been a simple way to drill, and a nice change from the usual Times Tests.