3.OA.B.6 Flawed Reasoning- Division as Unknown Factor
Evidence Statement 3.C.4-2-Distinguish correct explanation/reasoning from that which is flawed, and if there is a flaw in the argument, present correct reasoning.
Marcus has 48 pieces of candy to share with 6 friends.
He wants each friend to get the same amount of candy.
Marcus thinks he should put 7 pieces of candy into a bag for each friend.
Marcus is incorrect in his reasoning.
- What is the error in Marcus' reasoning?
Explain the error in Marcus' reasoning in the space provided.
Explain how Marcus can correct his reasoning.
Write an equation or your explanation to help Marcus correct his reasoning.
Score of 1 Point:
- Reasoning component- the student correctly identify the reasoning error.
Sample student response: Marcus is incorrect because 48÷ 6= 8 not 7. Or 6 x 7 = 42
Score of 2 Points- Student response contains the following 2 elements
- Computation Component- Student correctly solves 48 ÷ 6 = 8
- Reasoning Component- Student explains that multiplication is the opposite of division.
Sample Student Response: Marcus could use multiplication to solve the problem. He could use the equation 6 x ? = 48 and find what factor multiplied by 6 has a product of 48.
Score of 1 Point- Student response contains 1 of the 2 elements.
Score of 0 Points- Student response is incorrect or irrelevant.