## ◂Math Worksheets and Study Guides First Grade. One Less, One More

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

Operations and Algebraic Thinking
Cluster: Understand and apply properties of operations and the relationship between addition and subtraction.
KY.1.OA.4. Understand subtraction as an unknown-addend problem. (MP.2, MP.7)
Cluster: Add and subtract within 20.
KY.1.OA.6. Add and subtract within 20. (MP.2, MP.7, MP.8)
KY.1.OA.6.a. Fluently add and subtract within 10.
KY.1.OA.6.b. Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making 10; decomposing a number leading to a 10; using the relationship between addition and subtraction; creating equivalent but easier or known sums.
Numbers and Operations in Base Ten
Cluster: Use place value understanding and properties of operations to add and subtract.
KY.1.NBT.4. Add within 100 including adding a two-digit number and a one-digit number. Add a two-digit number and a multiple of 10. (MP.7, MP.2, MP.3)