Kinder-Gardening: I made a larger version of a number bracelet using a hula hoop and pool noodles that I cut into "beads." This is also handy when decomposing numbers. You can add or take off as many beads as you need!

venn diagram with hula hoops! First week activity idea: each day there's a new statement on the board. Students come in and place their picture in the appropriate hoop!