Common Core State Standards for Math
1.NBT.B.2.a
6b9cbaef-d7cc-11e8-824f-0242ac160002 6b9ccf1c-d7cc-11e8-824f-0242ac160002 6b9cd178-d7cc-11e8-824f-0242ac160002 1.NBT.B 1.NBT.B.2 1.NBT.B.2.a
10 can be thought of as a bundle of ten ones — called a "ten."
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