In the envelope and counter model, what does the envelope stand for? What does one counter stand for? What does the center line stand for?
Question: In the envelope and counter model, what does the envelope stand for? What does one counter stand for? What does the center line stand for?
Sample answer: The envelope stands for the variable, such as , because it holds an unknown number of counters. One counter stands for the number . The center line stands for the equal sign . For example, an envelope and three counters equal to eight counters gives .
Key points:
- The envelope stands for the variable, such as .
- One counter stands for the number .
- The center line stands for the equal sign .
- An envelope and three counters equal to eight counters gives .
Rubric: Full credit: correctly states the envelope as the variable (), one counter as , and the center line as the equal sign. Partial credit: correctly identifies one or two of the three parts. No credit: none identified correctly.
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