Task# Assessing Counting Sequences Part I

Illustrative MathematicsVaries

Many students, especially English Language Learners, have trouble with the articulation of the 'teen' numbers and say 50 for fifteen, 60 for sixteen, or 70 for seventeen. Related to this, students may shift from the teen number to counting by tens with some variation of this type of counting sequence: '13, 14, 50, 60, 70...' Students often run into a trouble spot while counting forward when crossing from one family into the next family. For example, a student may get stuck at 29 and not be able to continue or may continue inappropriately saying something like '28, 29, 90, 91...'.