This activity is one of my student's favorites. We used this "read and write the room" type activity for several of our math operations and concepts. I post these activity cards "presents" around the room. Using a clipboard, recording sheet and pencil, students work with a partner to move around the room, read the problems and calculate the elapsed time. After all have finished, you have the option of checking these together or taking up the recording sheet for a grade. You may want to alter this plan and just have it as one of your math centers. Either way, this activity saves lots of copies from being made and it strongly engages my studnets.
Know that this is a single activity found in my unit "Santa's Literacy and Math Activities". If this is all you need, then you have the right product. However, if you purchase the complete unit, you would save $14 as opposed to purchasing all of them separately (7 activities [4 math activities and 2 literacy] plus a holiday newsletter format for only $8)