One envelope and three counters on the left equal eight counters on the right, showing . What does each part mean in algebra: the envelope, one counter, and the center line?
Case context: An envelope holds an unknown number of counters. A counter is one item. A center line splits the left and right sides. Here the model shows .
Question: One envelope and three counters on the left equal eight counters on the right, showing . What does each part mean in algebra: the envelope, one counter, and the center line?
Sample answer: The envelope is the unknown, the variable . One counter is a known number, a constant. The center line is the equal sign, .
Key points:
- The envelope represents the variable, an unknown number such as .
- One counter represents a constant, a known number.
- The center line represents the equal sign .
Rubric: Full credit: correctly names all three parts (envelope = variable/unknown, counter = constant/known number, center line = equal sign). Partial credit: names one or two parts correctly.
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