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Tens in 23

Task Statement

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

IM Commentary

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.  

Collaborators, saint177