- 1.NBT.A.1 Count to 120, starting at any number. In this range, read and write numerals and represent a number of objects with a written numeral.
- 1.NBT.B.2 Understand that the digits of a two-digit number represent amounts of tens and ones.
- 1.NBT.C.5 Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.*