**CCSSK.NBT.A.1**

Compose and decompose numbers from 11 to 19 into ten ones and some further ones, e.g., by using objects or drawings, and record each composition or decomposition by a drawing or equation (e.g., 18 = 10 + 8); understand that these numbers are composed of ten ones and one, two, three, four, five, six, seven, eight, or nine ones.

**CCSS1.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:

**CCSS1.NBT.B.3**

Compare two two-digit numbers based on meanings of the tens and ones digits, recording the results of comparisons with the symbols >, =, and <.

**CCSS2.NBT.A.1**

Understand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones; e.g., 706 equals 7 hundreds, 0 tens, and 6 ones. Understand the following as special cases:

**CCSS2.NBT.A.3**

Read and write numbers to 1000 using base-ten numerals, number names, and expanded form.

**CCSS2.NBT.A.4**

Compare two three-digit numbers based on meanings of the hundreds, tens, and ones digits, using >, =, and < symbols to record the results of comparisons.