1.OA.A.2 - About the Math, Learning Targets, and Increasing Rigor

Grade 1 Number Concepts

1.OA.A.2

Full Standard

Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.

 

Measurement Topic

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

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

 

 

 

 Report Card Measurement Topic: Adds and subtracts to solve word problems.

 
Kindergarten Students Learning 1st 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.

  • Represent addition and subtraction word problems using objects, drawings, and equations with unknown numbers in different positions.
  • Explain how three whole numbers can be added using physical models, drawings, number lines, and number charts. 
  • Add three whole numbers whose sum is less than or equal to 20.
  • Solve word problems with three whole numbers using objects, drawings, and equations.
  • Reorder three addends to add efficiently (e.g. 3 + 8 + 7 can be though of as 3 + 7 + 8 knowing that 3 + 7 = 10).

When adding more than two addends, students need to understand that the numbers can be grouped in many different ways. This is an informal introduction into the commutative and associative properties for addition. At this grade, students do not need to know the formal names of the properties but they need to understand that when adding three addends that they should look for friendly numbers to add first. For example, when adding 2 + 9 + 8, add the 2 + 8 to make ten and then add the 9. Students need to see addition problems written both vertically and horizontally. Essential vocabulary for this standard includes: addition, add, subtraction, subtract, commutative property, and associative property (online dictionary Links to an external site., Download HCPSS Vocabulary Cards

).

 

 

Progression of Standard within Grade 1

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
  • Represent addition and subtraction word problems using objects, drawings, and equations with unknown numbers in different positions.
  • Explain how three whole numbers can be added using physical models, drawings, number lines, and number charts. 
  • Add three whole numbers whose sum is less than or equal to 20.
  • Solve word problems with three whole numbers using objects, drawings, and equations.
  • Reorder three addends to add efficiently (e.g. 3 + 8 + 7 can be though of as 3 + 7 + 8 knowing that 3 + 7 = 10).

(connects to associative property in 1.OA.B.3)

 

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
Kindergarten Grade 2
  • Use objects or drawings to solve addition and subtraction word problems (K.OA.2)
  • Solve simple put- together, take-apart, and compare problems using information presented in a bar graph (2.MD.10)

 

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