This task is for second graders trying to understand the properties of single-digit subtraction. Students must agree or disagree on if the commutative property is true for subtraction. Agree or Disagree? asks students to explain their thinking.
Microsoft Word version: 2_OA_Subtraction_Problem_Critique_AgreeOrDisagree
PDF version: 2_OA_Subtraction_Problem_Critique_AgreeOrDisagree
Second graders are required to solve double digit addition number problems with and without regrouping. They sometimes have a problem determining whether or not they need to regroup. In this problem they need to explain how they solved it and what tool they used. Most students would choose to use place value blocks or a hundreds or two hundreds chart to prove their answer.
Microsoft Word version: Gr_2_OA_AdditionMultiDigit_Problem_Critique
PDF version: 2_OA_AdditionMultiDigit_Problem_Critique
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I used this task early on for my 3rd grade class. The reason for giving this task was to allow students to see and recognize the commutative property of addition. The problem is very basic, and allows space for students to give their claim and argument, and also to have a discussion with a partner. Students struggled with understanding what the word “equals” means. They were not used to seeing an equation after the equal sign. Once students understood that equals actually means “the same,” they had a better understanding of how the commutative property works.
Microsoft Word version: 2_NBT_PropertiesCommutative_ThinkPairShare_Construct
PDF version: 2_NBT_PropertiesCommutative_ThinkPairShare_Construct
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