To the teacher:
Many acitivites are self-explanatory and contain follow-up questions. Answers to the questions are found within the explanation. Consider requiring students to copy the explanatory paragraph as part of the follow-up activity. Because of the nature of these activities grades can be based on a 5 point scale. Perfect papers receive 5 points (A), 4 points (B), 3 points (D). After a few low grades students usually begin to read the explanation carefully before answering the questions.
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