The counting on addition strategy is a great mental math strategy used to build number fact fluency. To put it simply, counting on involves adding 1, 2 or 3 to a number. 5 + 3, 6 + 2, 8 + 1 are all count on facts. So are 3 + 8, 2 + 14 and 1 + 7. What we want to achieve when teaching counting on, is for children to understand that they will start with the larger number in the addition sentence and count on 1, 2 or 3. We don't want them counting up to the larger number, for