NC.2.NBT.3

• This standard calls for students to read and write the numbers 1-999 in a variety of ways, including: 

  • • Base ten numerals (e.g., 123) *This is also called standard form. 

    • Number names (e.g., one hundred twenty-three) *This is also called word form.

    • Expanded form (e.g., 100 + 20 + 3). 

• When reading and writing whole numbers, the word “and” should not be used (e.g., 235 is stated and written as “two hundred thirty-five”).

• Students also explore the idea that numbers can be composed of different variations of ones, tens, and hundreds. For example, the representations for 100 include: 

  • • 1 hundred 

    • 10 tens 

    • 9 tens + 10 ones 

    • 8 tens + 20 ones 

NOTE: Expanded form is a critical aspect of this standard as it is foundational for adding and subtracting multi-digit numbers in Grades 2, 3, and 4 with whole numbers. Students need ample experience representing numbers with base ten blocks or pictures of base ten blocks (NC.2.NBT.1) and writing the numbers using base-ten numerals and expanded form (NC.2.NBT.3).