These are simple to put together STEM tubs. They cover a variety of 2nd, 3rd, and 4th grade standards.
They are FABULOUS for early finishers, introducing topics, centers, morning work, and behavior incentives!
Easy to change out tubs. I use the shoebox tubs and keep things stored in ziploc bags when they are not being used. I also throw in a book that relates to the topic. This is a great way to add reading to the tubs!