This task is geared towards third graders. The task states a problem asking for the difference between two quantities and asks students to crititque two statements about the problem: Is finding the difference an addition or subtraction problem? Students are provided space to think about the problem, make a claim, and provide evidence. This task could start a class discussion about how students might think differently about subtraction problems. Some students may state that this is subtraction because one can subtract the two quantities to find a difference while other students may look at this as an addition problem by looking at how much must be added to one quantity to get to the next.
Microsoft Word version: 3_OA_SubtractionAddition_TalkFrame_Critique
PDF version: 3_OA_SubtractionAddition_TalkFrame_Critique