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

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

#### Kentucky Academic Standards

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)
KY.1.NBT.4.a. Add within 100 using…
strategies based on place value
KY.1.NBT.6. Subtract multiples of 10 in the range 10-90 from multiples of 10 in the range 10-90 (positive or zero differences). (MP.3, MP.5)
KY.1.NBT.6.a. Subtract using:
concrete models or drawings
strategies based on place value