## ◂Math Worksheets and Study Guides First Grade. Subtraction Facts

### The resources above correspond to the standards listed below:

#### Georgia Standards of Excellence

GA.MGSE1.OA. Operations and Algebraic Thinking
Understand and apply properties of operations and the relationship between addition and subtraction.
MGSE1.OA.4. 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
MGSE1.OA.5. Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).
MGSE1.OA.6. Add and subtract within 20.
MGSE1.OA.6a. 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).
MGSE1.OA.6b. Fluently add and subtract within 10.