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## Common Core Standards (1.OA)

**Represent and solve problems involving addition and subtraction.**

- Use addition and subtraction within 20 to solve word problems involving

situations of adding to, taking from, putting together, taking apart,

and comparing, with unknowns in all positions, e.g., by using objects,

drawings, and equations with a symbol for the unknown number to

represent the problem.2 - 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.

**Understand and apply properties of operations and the relationshipbetween addition and subtraction.**

- Apply properties of operations as strategies to add and subtract.3 Examples:

If 8 + 3 = 11 is known, then 3 + 8 = 11 is also known. (Commutative property of

addition.) To add 2 + 6 + 4, the second two numbers can be added to make

a ten, so 2 + 6 + 4 = 2 + 10 = 12. (Associative property of addition.) - Understand subtraction as an unknown-addend problem. For example,

subtract 10 – 8 by finding the number that makes 10 when added to 8.

**Add and subtract within 20.**

- Relate counting to addition and subtraction (e.g., by counting on 2 to

add 2). - Add and subtract within 20, demonstrating fluency for addition and

subtraction within 10. Use strategies such as counting on; making ten

(e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to

a ten (e.g., 13 – 4 = 13 – 3 – 1 = 10 – 1 = 9); using the relationship between

addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 – 8

= 4); and creating equivalent but easier or known sums (e.g., adding 6 +

7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).

**Work with addition and subtraction equations.**

- Understand the meaning of the equal sign, and determine if equations

involving addition and subtraction are true or false. For example, which

of the following equations are true and which are false? 6 = 6, 7 = 8 – 1,

5 + 2 = 2 + 5, 4 + 1 = 5 + 2. - Determine the unknown whole number in an addition or subtraction

equation relating three whole numbers. For example, determine the

unknown number that makes the equation true in each of the equations 8 +

? = 11, 5 = � – 3, 6 + 6 = �.

## Resource Examples

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