2.NBT.A.3 - About the Math, Learning Targets, and Increasing Rigor

Grade 2 Number Concepts

2.NBT.A.3

Full Standard

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

 

Measurement Topic

This standard is reported on the report card in these quarters as follows:

2nd Grade Students Learning 2nd Grade Standards
Quarter 1 Quarter 2 Quarter 3 Quarter 4

Report Card Measurement Topic: Demonstrates understanding of number concepts and relationships

  
1st Grade Students Learning 2nd Grade Standards
Quarter 1 Quarter 2 Quarter 3 Quarter 4

Report Card Measurement Topic: Demonstrates understanding of number concepts and relationships

  

 

About the Math

Skills and concepts below are learning goals for this standard.

  • Read and write numbers up to 1,000 using base-ten numerals (e.g., 234)
  • Read and write numbers up to 1,000 using number names (e.g., two hundred thirty-four).

Our base-ten system is the Hindu-Arabic numeration system that is a positional system which means there are place values. It is based on repeated groupings of ten. Therefore, the system is also known as base ten or decimal numeration system. For example, in the number 64 the 6 represents 6 tens but on the face value the 6 may appear to be 6 ones to students. Larger numbers are read by naming the period of each group. This refers to the hundreds, tens, and ones. 

  • Read and write numbers using expanded form (e.g., 200 + 30 + 4).
  • Decompose numbers using expanded form.

Students must know how to write numbers in expanded form. This understanding supports the development of flexible computation strategies. It will be specifically used for finding partial sums of two and three-digit numbers. 

  • Record number decompositions in various ways (i.e. 234 as 230 + 4, 199 + 35, 200 + 34, or 225 + 14)

There are an infinite number of ways to decompose numbers. Students should be comfortable decomposing numbers in various, useful ways. The examples noted above are some of the more useful. Students should also be able to note when certain decompositions might be more useful. For example, when adding 230 + 276 it's useful to think of 276 as 206 + 70 so that 230 + 276 can be thought of as 300 + 206.

Essential vocabulary for this standard includes  place value, expanded form, decomposition, base-ten numerals, digit , and numerals. 

 

 

Progression of Standard within Grade 2

This progression informs how to develop the standard within the grade level. This progression is provided by HCPSS Elementary Mathematics.

Progression Throughout Year
Quarter 1 Quarter 2 Quarter 3 Quarter 4
  • Read and write numbers up to 1,000 using base-ten numerals (e.g., 234)
  • Read and write numbers up to 1,000 using number names (e.g., two hundred thirty-four).
  • Read and write numbers using expanded form (e.g., 200 + 30 + 4).
  • Decompose numbers using expanded form.
  • Record number decompositions in various ways (i.e. 234 as 230 + 4, 199 + 35, 200 + 34, or 225 + 14)
 *Revisit this standard throughout the year through routines, independent practice, discussions, and other activities. *Revisit this standard throughout the year through routines, independent practice, discussions, and other activities. *Revisit this standard throughout the year through routines, independent practice, discussions, and other activities.

 

Progression of this Standard Across Grades

This progression is informed by the Achieve the Core Coherence Map Links to an external site.. Information is not the complete standard.

Progression Across Grades
Grade 1 Grade
  • Understand that the two digits of a two-digit number represent amounts of tens and ones (1.NBT.2)

This concept is not taught after Grade 2. Students are expected to apply the standard proficiently.

 

 

 

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