Need a more visual way of finding numbers that make 10? Guide your students with this "complements of 10" or "friends of 10 activity". Friends of 10: (0,10... 1,9... 2,8... 3,7...4,6...5,5). Print the worksheet in B&W or color, find all the friends of 10, then write them as number sentences. Pair it with some part, part, whole hand motions and you're ready to go!