You can use this in relation to a unit on balloons as well. Draw one big balloon on a piece of poster board and then draw one little balloon on the poster board. Have your children try to identify which is big and which is little. Then use real balloons. One big one and one little one. Pass them around and ask each child to try and tell you who is holding the big balloon and who is holding the small balloon. It’s really simple but it works well.
Use a large piece of butcher paper and tape it length wise to a door or a wall. Measure each child’s height and mark off on the paper ( put there name with it). Have a discussion about tall and short (big and small). Who is smallest? biggest?