Common Core State Standards for Math

1.NBT.B.2.c

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.c

The numbers 10, 20, 30, 40, 50, 60, 70, 80, 90 refer to one, two, three, four, five, six, seven, eight, or nine tens (and 0 ones).

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