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

Grade 1 Number Concepts

1.OA.A.1

Full Standard

Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, 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.

 

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

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

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.

Report Card Measurement Topic: Demonstrates understanding of subtraction.

Report Card Measurement Topic: Demonstrates understanding of addition.

Report Card Measurement Topic: Demonstrates understanding of subtraction.

Report Card Measurement Topic: Demonstrates understanding of addition.

Report Card Measurement Topic: Demonstrates understanding of subtraction.

 

About the Math

Skills and concepts below are learning goals for this standard.

  • Represent addition and subtraction word problems using objects and drawings

Word problems involve different problem situations. Often students are presented with problems of only one situation. Because of this students, begin to develop procedural approaches to solving problems. Procedural approaches that do not support problem-solving skills include identifying key words. Students should not rely on key words. Instead, students should develop understanding through representations and diagrams including bar diagrams. There is a progression for working with problem-solving in first grade. See below. 

  • Write an equation for an addition or subtraction word problem with unknown numbers in different positions.
  • Explain how an equation represents an addition or subtraction word problem. 

From the beginning, students should have their representations connected to equations. These early equations may be teacher generated. In time, students can then develop their own equations. Throughout, equations should be explicitly connected to the problems and representations so that students deeply understand how equations can be used to solve problems.

  • Solve word problems with unknown numbers in different positions.

This learning target is grounded in the work of problem-solving with different problem-solving representations. The equation, including the unknown, should be related to the problem and the problem type. See below for the types or situations of problems to focus on throughout the year. 

 

Achieve the Core Progressions documents Links to an external site. provide further clarification regarding problem types at different grade levels as follows:

  • Kindergarten should work with the following four problem subtypes: Add To- Result Unknown, Take From- Result Unknown, Put Together/Take Apart- Total Unknown, and Put Together/Take Apart- Both Addends Unknown
  • Grade One should work with all problem subtypes. However, the four most difficult problem subtypes are not expected for mastery until Grade 2.  These subtypes include Add To- Start Unknown, Take From- Start Unknown, Compare- Bigger Unknown, and Compare- Smaller Unknown
  • Grade Two should work with all problem subtypes and mastery is expected with all subtypes at this grade level.

The Problem Solving page has more information about problem-solving structures, situations, and resources.

 

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
  • Use addition and subtraction within 20*
  • Use Result unknown problems (add to, take from, put together, take apart
  • Represent addition and subtraction word problems using objects and drawings
  • Write an equation for an addition or subtraction word problem with unknown numbers in different positions.
  • Explain how an equation represents an addition or subtraction word problem.
  • Solve word problems with unknown numbers in different positions.
  • Use addition and subtraction within 20
  • Result unknown and change unknown (add to, take from, put together, take apart, and comparison)
  • Represent addition and subtraction word problems using objects and drawings
  • Write an equation for an addition or subtraction word problem with unknown numbers in different positions.
  • Explain how an equation represents an addition or subtraction word problem. 
  • Solve word problems with unknown numbers in different positions.
  • Use addition and subtraction within 20
  • Result unknown and change unknown (add to, take from, put together, take apart, and comparison)
  • Represent addition and subtraction word problems using objects and drawings
  • Write an equation for an addition or subtraction word problem with unknown numbers in different positions.
  • Explain how an equation represents an addition or subtraction word problem.
  • Solve word problems with unknown numbers in different positions.
  • Use addition and subtraction within 20.
  • Result unknown, change unknown, and start unknown (add to, take from, put together, take apart, and comparison)
  • Represent addition and subtraction word problems using objects and drawings
  • Write an equation for an addition or subtraction word problem with unknown numbers in different positions.
  • Explain how an equation represents an addition or subtraction word problem.
  • Solve word problems with unknown numbers in different positions.

Working within 10 is recommended in the first quarter but can be exceeded.

 

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)
  • Use addition and subtraction to solve one- and two-step word problems (2.OA.1)

 

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