This is a great activity how to teach student by letting students discover by themselves about Pigeonhole Principle. This activity can be used for grade 7 to 10!
If you need a math break lesson, have this fun activity, let your student know that math can be this fun! This activity will lead student discover about Pigeonhole principle by themselves and a lot of related activities included like "same month birthday activity", "matching sock colors", "friends", etc.. These are all real world activity where students can relate and have fun answering the activity while sharpening their math skills :) This activity includes answer key and explanation on each problem set.
It would be nice to let student work with groups and let them explain their answers afterward, for your class to have a mathematical classroom discourse :)
I hope this activity will bring great help and fun in your math class!