Illuminations: Counting Back and Counting On

This lesson, which focuses on the counting model for subtraction, begins with reading a counting book.

The students model the numbers as the book is read. Then they make a chain of links and write in vertical and horizontal format the differences suggested by adding and subtracting one link at a time from their chains. Finally, they draw a chain showing one link being taken away and write in two formats the difference it represents.

 

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Addition & Subtraction
K-6, Educator

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Illuminations (National Council of Teachers of Mathematics)

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