The perfect way to automate the operation. With this menthal mat worksheet you can give the students 5 minutes by clock to complete the worksheet. It has a space for their score and time.
You can acces to another worksheet on this publication.
It's a great way to keep track of the student development and you can make different goals for them to achieve less minutes on each time.

Disclaimer: I downloaded this resource from superteacherworksheets with a paid account.