2.OA.2 Addition and Subtraction Fluency within 20 2.OA.B.2 2nd Grade Math

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  1. This is a second grade math bundle, that contains all 4 standards within the Operations and Algebraic Thinking (OA) 2nd grade Common Core domain. Within this domain, there are full lesson plan units that cover addition and subtraction word problems, addition and subtraction strategies, odd and even,
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  2. This is an all-year math bundle that contains all four Common Core domains. Each domain has second grade standards-based math units for Geometry (G), Measurement and Data (MD), Addition and Subtraction (OA), and Place Value (NBT). Every single unit within this bundle comes with lesson plans, differ
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This second grade math standards-based Operations and Algebraic Thinking unit focuses on the Common Core math standards 2.OA.2. This asks students to fluently add and subtract within 20, using counting on, counting back, and other mental strategies. There are daily lesson plans, whole group activities, partner practice activities, MATH group centers, exit slips, and assessments.

What's included in the 6 daily lesson plans:

  • Whole group activity
  • Partner practice activity
  • MATH group: Math writing, Apply new skills, Teacher time, Hands-on math (Teacher time is differentiated learning opportunities for remediation, on-level, and enrichment.)
  • Exit slip

2.OA.2 Focus:

--Day 1- Doubles and Near-Doubles

--Day 2- Finding a Ten Within

--Day 3- Part-Part-Whole Mats

--Day 4- Related Facts and Fact Families

--Day 5- Mentally Counting On and Counting Back

--Day 6- Fluent Math Mixed Review

This math unit is part of a 2nd grade OA bundle. Click HERE for the bundle.

This unit is also part of a full-year Common Core Standards based bundle that you can find HERE.


Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all sums of two one-digit numbers.

The 2.OA.2 activities that are included in my short answer, centers, printables, and interactive notebooks are similar but have all been changed to fit these lesson plans. The short answers have different prompts and are now part of MATH groups, the printables & interactive notebooks have been updated and are used during the 'Apply new skills' part of MATH groups.

Total Pages
Answer Key
Teaching Duration
1 Week
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to see state-specific standards (only available in the US).
Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all sums of two one-digit numbers.


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