Mathematical Advent Calendar Template

This is a template I created for students to create their own Mathematical advent calendar. The idea is that you print off the front sheet, students cut around the dashed lines to open the 'doors&', they then stick this sheet onto a blank piece of the same sized paper. Then, they write mathematical calculations, sums, equations etc on the &';doors', the answers to which will be the numbers 1-25. They then write jokes, fun facts, pictures etc in the &'doors&';. Let me know what you think.