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Standards

CCSS.Math.Content.1.NBT.B.2

Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases:

CCSS.Math.Content.1.NBT.B

Understand place value.

Number and Operations in Base Ten

Common Core State Standards (CCSS) Initiative: Mathematics Standards

CCSS.Math.Content.1.NBT.B.2a 10 can be thought of as a bundle of ten ones — called a "ten."