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Common Core State Standard 2.OA.2
Operations & Algebraic Thinking
Add and Subtract Within 20
2. Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all sums of two one-digit numbers.
Common Core State Standards: 2.OA.2
Single
Digit Addition Worksheets
Common Core State Standards:
2.OA.2 
Operations & Algebraic Thinking
Add and subtract within 20.
Fluently add and subtract within 20 using mental strategies. 2 By end of Grade 2, know from memory all sums of two one-digit numbers.
Single
Digit Addition Fluency Drills Worksheets
Common Core State Standards:
2.OA.2 
Operations & Algebraic Thinking
Add and subtract within 20.
Fluently add and subtract within 20 using mental strategies. 2 By end of Grade 2, know from memory all sums of two one-digit numbers.
Three
Single Digit Numbers Addition Worksheets
Common Core State Standards:
2.OA.2 
Operations & Algebraic Thinking
Add and subtract within 20.
Fluently add and subtract within 20 using mental strategies. 2 By end of Grade 2, know from memory all sums of two one-digit numbers.
Single
Digit Subtraction Worksheets
Common Core State Standards:
2.OA.2 
Operations & Algebraic Thinking
Add and subtract within 20.
Fluently add and subtract within 20 using mental strategies. 2 By end of Grade 2, know from memory all sums of two one-digit numbers.