What a great way to learn math! What kid doesn't love Legos? Again I would laminate these to be reusable, provide Legos to use as math manipulatives. Students could solve the problems and then self check using the Legos.
Had when i worked in a preschool and kids love them! I would use colored sand instead of white salt. DIY salt tray with alphabet cards. Easy to make and kids have fun smoothing out the salt after correctly making the letter