Sorting is fun and you can use similar objects to sort by size , an important skill for preschoolers to master. 1. Gather your materials. You will need some fake apples ( or red pom poms!), some containers ( these are berry ones I saved), paper, scissors and markers. 2.Start by drawing 3 apples, small, medium and large. Label them as well. If you want to make it tougher omit the signs. My 3.5 year old did fine without them. Pop them in the baskets. 3. Start sorting!