These 16 worksheets (2 per standard) are aligned to meet all Operations and Algebraic Thinking (OA) Common Core standards for 1st grade math. This 36 page document will supply all your OA worksheet needs for ALL 1st grade math skills. Several types of questions for each standard help you assess your students' mastery of each NBT standard.

The following standards are covered:

1.OA.1 - Addition & Subtraction Word Problems

1.OA.2 - Word Problems with Three Addends

1.OA.3 - Properties of Addition and Subtraction

1.OA.4 - Subtraction as Unknown-Addend Problems

1.OA.5 - Relate Counting to Addition and Subtraction

1.OA.6 - Addition & Subtraction within 20

1.OA.7 - Addition & Subtraction Equations

1.OA.8 - Equations with Unknowns

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What you get:

16 unique worksheets 2 for each standard

CCSS in the top right corner of each worksheet

2 Blank worksheet templates to write in your own problems

Answer keys

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Looking for more 1st-grade math worksheets? Try these links:

1st Grade Math Worksheets MEGA Bundle

-1st Grade Number & Operations in Base Ten Worksheets

-1st Grade Operations & Algebraic Thinking Worksheets

-1st Grade Measurement & Data Worksheets

-1st Grade Geometry Worksheets

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Get this and the rest of my 1st grade math resources at a fantastic discount when you buy my 1st Grade ULTIMATE Math Bundle!

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Check out my other first-grade math resources:

1st Grade ULTIMATE Math Bundle

-Task Cards Mega Bundle

-Exit Slip Mega Bundle

-Worksheet Mega Bundle

-Quizzes Mega Bundle

-Tests Mega Bundle

Number and Operations in Base Ten Bundle

-Task Cards

-Exit Slips

-Worksheets

-Quizzes

-Tests

Operations and Algebraic Thinking Bundle

-Task Cards

-Exit Slips

-Worksheets

-Quizzes

-Tests

Measurement and Data Bundle

-Task Cards

-Exit Slips

-Worksheets

-Quizzes

-Tests

Geometry Bundle

-Task Cards

-Exit Slips

-Worksheets

-Quizzes

-Tests

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Check out my task cards, exit slips, worksheets, quizzes, tests, and more for other grade levels:

In Printable Format:

⭐⭐ Math ULTIMATE Bundle for Grades K-6, PDF Format ⭐⭐

Kindergarten Math ULTIMATE Bundle, PDF Format

1st Grade Math ULTIMATE Bundle, PDF Format

2nd Grade Math ULTIMATE Bundle, PDF Format

3rd Grade Math ULTIMATE Bundle, PDF Format

4th Grade Math ULTIMATE Bundle, PDF Format

5th Grade Math ULTIMATE Bundle, PDF Format

6th Grade Math ULTIMATE Bundle, PDF Format

In Google Classroom Format:

⭐⭐ Math ULTIMATE Bundle for Grades K-6, Google Classroom Format ⭐⭐

Kindergarten Math ULTIMATE Bundle, Google Classroom Format

1st Grade Math ULTIMATE Bundle, Google Classroom Format

2nd Grade Math ULTIMATE Bundle, Google Classroom Format

3rd Grade Math ULTIMATE Bundle, Google Classroom Format

4th Grade Math ULTIMATE Bundle, Google Classroom Format

5th Grade Math ULTIMATE Bundle, Google Classroom Format

6th Grade Math ULTIMATE Bundle, Google Classroom Format

In Printable + Google Classroom Formats:

⭐⭐ Math ULTIMATE Bundle for Grades K-6, PDF + Google Classroom Formats ⭐⭐

Kindergarten Math ULTIMATE Bundle, PDF + Google Classroom Formats

1st Grade Math ULTIMATE Bundle, PDF + Google Classroom Formats

2nd Grade Math ULTIMATE Bundle, PDF + Google Classroom Formats

3rd Grade Math ULTIMATE Bundle, PDF + Google Classroom Formats

4th Grade Math ULTIMATE Bundle, PDF + Google Classroom Formats

5th Grade Math ULTIMATE Bundle, PDF + Google Classroom Formats

6th Grade Math ULTIMATE Bundle, PDF + Google Classroom Formats

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Improve your students' addition fact fluency with my Addition Quizzes Bundle and my Addition Blast Off Computer Game.

Improve your students' subtraction fluency with my Subtraction Quizzes Bundle and my Subtraction Blast Off Computer Game.