2.NBT.A.1 Flawed Reasoning_Jasleen Swim Ribbons

3.C.4-7 Flawed Reasoning 2.NBT

 The table below shows the number of ribbons a swim team earned during their swim season.

Ribbon Count

Part A

Jasleen says the team won 619 because 3+2+1=6, and 4+6+9=19. Explain why she is wrong. Then write the total number of ribbons earned.

Enter your explanation and answer below.

(coders add an answer box and equation editor)

Part B

Jasleen says the team won 25 less third place ribbons then first place ribbons because 3-1=2 

and 9-4=5. .Explain why she is wrong. Then write how many less third place ribbons were earned than first place.

Enter your explanation and answer in the space provided.

(coders add an answer box and equation editor)

Scoring Rubric Part A

Score 2 Student response includes the following 2 elements.  

• Computation component = 1 point  

o   The student provides the correct number of ribbons earned, 79 ribbons.  

• Reasoning component = 1 point  

o   The student explains that Jasleen did not use place value correctly.  

• Notes:  If a computation mistake is made, credit cannot be given for the computation component, but 1 point can be given for a valid explanation.  

Score 1 Student response include 1 of the above elements. 

Score 0 Student response is incorrect or irrelevant.

Scoring Rubric Part B

Score 2 Student response includes the following 2 elements.  

•  Computation component = 1 point  

o   The student correctly provides how many less third place ribbons were earned, 15 ribbons.  

• Reasoning component = 1 point  

o   The student explains that Jasleen did not use place value correctly.  

• Notes:  If a computation mistake is made, credit cannot be given for the computation component, but 1 point can be given for a valid explanation.  

Score 1 Student response include 1 of the above elements. 

Score 0 Student response is incorrect or irrelevant.