Illuminations: Using the Number Line to Compare

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

Because this model is based on linear measurement, it is a distinctly different representation from the models presented in the previous two lessons. At the end of this lesson, children are encouraged to predict differences and answer puzzles involving subtraction.

 

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Addition & Subtraction, Measurement & Time
K-6, Educator

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Illuminations (National Council of Teachers of Mathematics)

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