Grade 1 · Number and Operations in Base Ten

CCSS.MATH.CONTENT.1.NBT.B.2a

10 can be thought of as a bundle of ten ones — called a "ten."

Read this standard on the official Common Core site

Lessons that teach this standard

• Tens and Ones: Place Value to 99

  First grade place value: see a ten as ten ones, read a two-digit number as tens and ones, and compare two-digit numbers with the symbols >, = and <.