Lava lamps - plastic bottle + vegetable oil (half fill the bottle) + water (fill the rest of the bottle + 10 drops food coloring + alka-seltzer (broken into pieces, placed 1 at a time into the bottle) = lava bottle
A fun math game. roll two dice add or subtract and color in the square. You need to get four in a row to win. Would be a good game to have printed off for students to use after they finish their work and have nothing else to complete.