Apple seed estimation jar: collect two, same-size, small jars. Put 10 seeds in one jar; 32 seeds in the second jar. Write on a piece of paper "If this jar has 10 seeds then how many seeds are in the other jar?" Having a comparison number of seeds helps the children make better estimates. I use Sticky Tac to attach the jar with the 10 seeds to my desk or to a table. I don't want the jar to be moved. I leave the jar with 32 seeds unattached so the children can rotate and move it, turn it over, and make observations to support their estimates. I have pen and paper for them to write their estimates and a box for them to put them in.