Students can use counting as the basis of a range of strategies, including various kinds of additions and subtractions. Within these strategies, counting refers to more than producing the forward sequence of number words, sometimes called rote counting. If you ask a student what number comes after nine, he or she will often initially count from one to find the answer. To be able to use the strategy of counting-on, students need to be able to know the sequence of number words well enough to continue counting from any number. That is, you cannot count on from seven if you do not know the number word that follows seven.