2.OA.C.4 - About the Math, Learning Targets, and Increasing Rigor

Grade 2 Number Operations

2.OA.C.4

Full Standard

Use addition to find the total number of objects arranged in rectangular arrays with up to 5 rows and up to 5 columns; write an equation to express the total as a sum of equal addends.

 

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 multiplication and division

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

 

 

 

Report Card Measurement Topic: Demonstrates understanding of addition

 

About the Math

Skills and concepts below are learning goals for this standard.

  • color tile array 4 x 3Use addition to find the total number of objects in an array.

An array is an arrangement of objects in rows and columns. Each row has the same number of objects in it. One can repeatedly add the values in an array to find the total. At this point, there is no need to connect an array or the act of finding the total number of objects to multiplication.

  • Represent the total number of objects arranged in a rectangular array as an expression with the repeated addition of number of objects in each row (or column). For example if there are 3 rows with 4 objects in each row, I can write the expression 4 + 4 + 4 or I can write 3 + 3 + 3 + 3.
  • Write an addition equation (e.g., 3 + 3 + 3 = 9) to express the total as a sum of equal addends.

The image to the right can be represented as 3 + 3 + 3 + 3 = 12 or 4 + 4 + 4 = 12. Both are correct. Students should be able to connect their equations directly to the array they are citing.

Essential vocabulary for this standard includes: rectangular array, addends, row, column, repeated addition, and equal groups

 

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

 

  • Use addition to find the total number of objects in an array.
  • Represent the total number of objects arranged in a rectangular array as an expression with the repeated addition of number of objects in each row (or column). For example if there are 3 rows with 4 objects in each row, I can write the expression 4 + 4 + 4.
  • Write an addition equation (e.g., 3 + 3 + 3 = 9) to express the total as a sum of equal addends.

 

 

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 3
  • Understand the meaning of the equal sign (1.OA.7)
  • Interpret products of whole numbers (3.OA.1)

 

Back to Top