Illuminations: Counting Back and Counting On

In this lesson, students model subtraction with connecting cubes while the teacher reads to them from counting books.

Then children make a train of connecting cubes and write in vertical and horizontal format the differences suggested by adding to and subtracting from the train one cube at a time. Finally, they record, in written form, a train showing one cube being taken away and record the difference in vertical and horizontal format.

 

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Addition & Subtraction, Number Values & Counting
K-6, Educator

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Illuminations (National Council of Teachers of Mathematics)

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