Illuminations: Hopping Backward to Solve Problems

In this lesson, students determine differences using the number line to compare lengths.

Because this meaning is based on linear measurement, it is a distinctly different representation from the meanings presented in Lessons One and Two. At the end of the lesson, the students use reasoning and problem solving to predict differences and to answer puzzles involving subtraction.

 

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Addition & Subtraction
K-6, Educator

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Illuminations (National Council of Teachers of Mathematics)

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