This reminded me of Math Pickle. Math Pickle (https://mathpickle.com/organized-by-grade/ https://mathpickle.com/organized-by-grade/) has a lot of kid-friendly

This reminded me of Math Pickle. Math Pickle (https://mathpickle.com/organized-by-grade/ https://mathpickle.com/organized-by-grade/) has a lot of kid-friendly math puzzles that are easy to explain but can become quite intriguing.