I love self-checking math activities. This one is perfect. All you need to do is place some calls to all your friends and family and ask them to hold on to some ketchup, toothpaste tube, and parmesan cheese lids.
What You Need
Lots of plastic flip-top caps
On the lid of each cap, write a math problem; I stuck with addition problems since my youngest is in kindergarten.
Pop the top and write the answers on the bottom part of the cap.
Give your kiddo the caps. They'll answer the problems, open the caps and check their math.
This great idea came from Flap Jack Educational Resources.