Explain the student's mistake and write the correct expression.
Case context: A student translates 'nine less than a number ' as .
Question: Explain the student's mistake and write the correct expression.
Sample answer: The student subtracted from instead of from . The correct expression is .
Key points:
- The phrase 'less than' means subtracting from the value that comes after it.
- The starting value is , not .
- The correct expression is .
Rubric: Identifies that the subtraction order is reversed and provides the correct expression: .
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