Related Topics:

Lesson Plans and Worksheets for Grade 2

Lesson Plans and Worksheets for all Grades

More Lessons for Grade 2

Common Core For Grade 2

Examples, solutions, videos, and songs to help Grade 2 students learn how to 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: 2.OA.2

### Suggested Learning Target

**2.OA.2 - Mental Math Strategies: Make 10**

How to use mental strategies to add within 20 using the "make 10" strategy. This is one of the strategies suggested in the Common Core State Standards for Mathematics, 2.OA.2.

**2.OA.2 - Mental Math Strategies: Use Known Equivalent Sums**

How to use mental strategies to add within 20 using known sums to solve unknown sums?**2.OA.2 - Mental Math Strategies: Addition & Subtraction Relationship**

How to use mental strategies to add and subtract within 20 using the relationship between addition and subtraction?

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

Lesson Plans and Worksheets for Grade 2

Lesson Plans and Worksheets for all Grades

More Lessons for Grade 2

Common Core For Grade 2

Common Core: 2.OA.2

- I can use mental strategies (e.g., count on, make a ten) to add or subtract numbers within 20 with ease.
- I can recall from memory all sums of two one-digit numbers.

How to use mental strategies to add within 20 using the "make 10" strategy. This is one of the strategies suggested in the Common Core State Standards for Mathematics, 2.OA.2.

How to use mental strategies to add within 20 using known sums to solve unknown sums?

How to use mental strategies to add and subtract within 20 using the relationship between addition and subtraction?

Rotate to landscape screen format on a mobile phone or small tablet to use the **Mathway** widget, a free math problem solver that **answers your questions with step-by-step explanations**.

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

We welcome your feedback, comments and questions about this site or page. Please submit your feedback or enquiries via our Feedback page.