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Abacus

Abacus

Purpose of the tool

Learn how to add and subtract.

Grade: 1,2
Common core standards: 
MP4 MP5 1.OA.C.5 1.OA.C.6 1.NBT.C.4 2.NBT.A.2 2.NBT.B.5 2.NBT.B.6 2.NBT.B.7 2.NBT.B.9

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