These are meant to be timed tests for subtraction fluency. Students should be given 2 minutes to see how many they can do. We have been doing this all year and the kids love it. After I made it and shared it with one or two teachers at my school I noticed other grade levels printing them off in the copy room so I thought it was worth selling! Hope your kids enjoy it as much as mine do!
See also Math Fluency - Addition :)