character: Mathlete Mike
topic: Understanding Subtraction with Number Lines
grade: 4
subject: Mathematics
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character: Subtraction Sammy
topic: Using Number Lines for Subtraction
grade: 4
subject: Mathematics
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character: Number Line Nancy
topic: Visualizing Subtraction on a Number Line
grade: 4
subject: Mathematics
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character: Calculation Carl
topic: Introduction to Number Lines in Math
grade: 4
subject: Mathematics
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