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Diagnose an Inverse-Operation Error
Grade Level
ParaPro
PPM.154 Diagnose an Inverse-Operation Error
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A student is solving s - (-6) = 13. Student work: Step 1: s - (-6) + 6 = 13 + 6; Step 2: s + 12 = 19. Which option identifies the first inverse-operation error and gives a prompt that restores balance?
A
Step 1; Prompt: "Add 6 to both sides because subtracting a negative means add 6 again.", for the values shown.
B
Step 1; Prompt: "Subtract 6 from both sides because s - (-6) is the same as s + 6."
C
Step 2; Prompt: "Check Step 2 because both sides increased by 6."
D
No error; Prompt: "Tell the student the equation is already balanced and continue."
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