**Free Printable Addition and Subtraction Worksheets** – A collection of easy-to-print addition and subtraction worksheets. Teach by using fact families! Memorize one, get three free. 2+8=10 therefore 8+2=10, 10-2=8, 10-8=2. You will also find mixed addition and subtraction worksheets, double-digit, triple digit addition and subtraction worksheets with and without regrouping.

**Add and subtract within 20.****
**CCSS.Math.Content.1.OA.B.3

Apply properties of operations as strategies to add and subtract.2 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.)

**CCSS.Math.Content.1.OA.C.5**

*Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).*

*CCSS.Math.Content.2.OA.B.2*

**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.**