Previous Standard
Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.
Next Standard
Understand the relationship between numbers and quantities; connect counting to cardinality.
Worksheets
![1.oa.3 Worksheets - Combining Addends worksheet 1.oa.3 Worksheets - Combining Addends worksheet](/math/addition/multiple addends - combining/english/thumb.png)
![1.oa.3 Worksheets - Combining Addends worksheet 1.oa.3 Worksheets - Combining Addends worksheet](/math/addition/multiple addends - combining/english/thumb.png)
![1.oa.3 Worksheets - Using Commutative Property worksheet 1.oa.3 Worksheets - Using Commutative Property worksheet](/math/properties/addition commutative/english/thumb.png)
![1.oa.3 Worksheets - Using Commutative Property worksheet 1.oa.3 Worksheets - Using Commutative Property worksheet](/math/properties/addition commutative/english/thumb.png)