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Tens in 23
Mary and Joey are discussing their answers to the problem posed to them by their teacher, “How many tens are in 237?” Mary says there are 3 tens. Joey says there are 23 tens. What evidence of mathematical understanding do you see in the students’ responses?
Write a follow-up question that you would ask each student.
Task of Teaching
Interpreting and evaluating alternative solutions and thinking; Analyzing students' thinking
The task is designed to focus attention on two of the foundational ideas of place value: base-ten concepts of grouping and written place-value notation.