This product is designed to be used as a small group or individual math center while teaching guided math. It reviews sums from 15-20. Print the number cards on cardstock, laminate, and cut. Fill a clean, empty bottle about two-thirds full of rice. You can color the rice using white vinegar and food coloring if you would like. Then, put the cards in the bottle and shake all of the pieces together. Students shake the bottle to reveal the numbers hidden inside and record their findings on the scavenger hunt sheet. There are multiple answers for each task.