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Lesson Planet
The most valuable part of this video isn't math-related (even though the math strategies are quite helpful); it's the way Sal replaces part of a problem that confuses him with easy-to-manipulate variable letters. Students who get hung up on a tricky element of a word problem would benefit immensely from the way Sal models thorough understanding and control of a given word math problem.
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BY-NC-SA: 3.0