Previous Standard
Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).
Next Standard
Understand the meaning of the equal sign, and determine if equations involving addition and subtraction are true or false.
Worksheets
![1.oa.6 Worksheets - Adding Within 20 worksheet 1.oa.6 Worksheets - Adding Within 20 worksheet](/math/addition/adding within 20/english/thumb.png)
![1.oa.6 Worksheets - Adding Within 20 worksheet 1.oa.6 Worksheets - Adding Within 20 worksheet](/math/addition/adding within 20/english/thumb.png)
![1.oa.6 Worksheets - Adding Within 20 (horizontal) worksheet 1.oa.6 Worksheets - Adding Within 20 (horizontal) worksheet](/math/addition/adding within 20 (horizontal)/english/thumb.png)
![1.oa.6 Worksheets - Adding Within 20 (horizontal) worksheet 1.oa.6 Worksheets - Adding Within 20 (horizontal) worksheet](/math/addition/adding within 20 (horizontal)/english/thumb.png)
![1.oa.6 Worksheets - Creating Tens worksheet 1.oa.6 Worksheets - Creating Tens worksheet](/math/addition/creating tens/english/thumb.png)
![1.oa.6 Worksheets - Creating Tens worksheet 1.oa.6 Worksheets - Creating Tens worksheet](/math/addition/creating tens/english/thumb.png)
![1.oa.6 Worksheets - Finding Equivalent Addition Problems with 10 worksheet 1.oa.6 Worksheets - Finding Equivalent Addition Problems with 10 worksheet](/math/addition/finding equivalent addition problems with 10/english/thumb.png)
![1.oa.6 Worksheets - Finding Equivalent Addition Problems with 10 worksheet 1.oa.6 Worksheets - Finding Equivalent Addition Problems with 10 worksheet](/math/addition/finding equivalent addition problems with 10/english/thumb.png)
![1.oa.6 Worksheets - Add and Subtract (Within 20) worksheet 1.oa.6 Worksheets - Add and Subtract (Within 20) worksheet](/math/drills/add and subtract (within 20)/english/thumb.png)
![1.oa.6 Worksheets - Add and Subtract (Within 20) worksheet 1.oa.6 Worksheets - Add and Subtract (Within 20) worksheet](/math/drills/add and subtract (within 20)/english/thumb.png)
![1.oa.6 Worksheets - Subtracting within 20 (horizontal) worksheet 1.oa.6 Worksheets - Subtracting within 20 (horizontal) worksheet](/math/subtraction/subtracting within 20 (horizontal)/english/thumb.png)
![1.oa.6 Worksheets - Subtracting within 20 (horizontal) worksheet 1.oa.6 Worksheets - Subtracting within 20 (horizontal) worksheet](/math/subtraction/subtracting within 20 (horizontal)/english/thumb.png)