AN algorithm for subtraction

Posted on 3/13/2017 by Scott Adamson
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A 2nd grade student shared an algorithm for subtraction that was learned at home. This provides a great opportunity to make sense of mathematics! With a focus on place value, the algorithm can be made sense of by our students. 

The PDF Pencast simply explains the algorithm...share it in class and use it as a context to make sense of math, develop number sense, focus on place value.

NOTE: Adobe Reader DC (or equivalent) is needed to view the "video" aspect of this pencast PDF.

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2.NBT.A.1 2.NBT.A.1a 2.NBT.A.1b 2.NBT.A.4 2.NBT.B.5 2.NBT.B.7 2.NBT.B.9
Math Practices
MP.1 MP.2 MP.3 MP.6 MP.7
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