Illuminations: Lost Buttons

In this lesson and the following one, students investigate subtraction more directly, beginning with the easier “take away” mode.

They model “take away” subtraction with buttons and write subtraction sentences. They also work with the additive identity (0) as an addend and as a difference and find missing addends.

 

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Addition & Subtraction
K-6, Educator

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Illuminations (National Council of Teachers of Mathematics)

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