Unit 2 - Lesson 8 - Grade 2: Illustrative Mathematics

Lin and Clare made base-ten diagrams to find the value of 71 - 56. What do you notice about their work? What do you wonder?

Lin and Clare each wrote equations to show their thinking. Explain how you know which group of equations matches Lin’s work and which matches Clare’s work.

How are Lin and Clare’s methods the same? How are they different?

Andre found the value of 65 - 28. He made a base-ten diagram and wrote equations to show his thinking. Do you think Andre’s method is more like Clare’s or Lin’s method? Explain.

Whose Method is it Anyway?Mai and Lin were asked to find the value of 63 - 18. Compare their methods. Name 1 thing that is the same about Mai and Lin’s methods.

Whose Method is it Anyway?Mai and Lin were asked to find the value of 63 - 18. Compare their methods. Name 1 thing that is different about Mai and Lin’s methods.