A set of 10 fun brain teasers for your students in lower grades.
Give your students one brain teaser a day or a week to try and solve. As a suggestion, you could have a solutions box at the front of the classroom.
Your students would then write their name and answer on a piece of paper and drop it into the box. At the end of the day or week you would reveal the answer.
Update: We have fixed the grammatical errors.