Sample problem: 12 + 10 = ___
1. Make a representation of the problem using tally marks in groups of 5. It is helpful to some students to circle the two groups to make sure that they did not leave anything out.
3. Count any single tally marks that are left after the groups of 5 are counted. The hardest part for students in this strategy is to go from counting in groups of 5 to counting singles. (For example, instead of counting 5, 10, 15, 20, 21, 22 students may try to count the single tally marks as groups of 5 like 5, 10, 15, 20, 25, 30.)