As we move into the teens and tens, children will have grasped the concept that the number symbols relate to quantities of things. The next logical step is the exploration of the concept of base 10, which is a traditional organization of numbers in much of the world. Once students have grasped and mastered the concept of 1-20, they begin to explore counting by 10’s and eventually, by 1’s all the way to 100. This learning path is so enjoyable to watch because of the meticulous level of concentration involved, and the inevitable “I did it!” when completed.
