Kentucky Academic Standards
Operations and Algebraic Thinking
Cluster: Add and subtract within 20.
KY.2.OA.2. Fluently add and subtract within 20 using mental strategies. (MP.2, MP.7, MP.8)
Numbers and Operations in Base Ten
Cluster: Use place value understanding and properties of operations to add and subtract.
KY.2.NBT.5. Fluently add and subtract within 100 using strategies based on place value, properties of operations and/or the relationship between addition and subtraction. (MP.2, MP.8)
KY.2.NBT.7. Add and subtract within 1000. (MP.1, MP.5)
KY.2.NBT.7.a. Represent and solve addition and subtraction problems using…
concrete models or drawings
strategies based on place value
relate drawings and strategies to expressions or equations
KY.2.NBT.9. Explain why addition and subtraction strategies work, using place value and the properties of operations. (MP.3, MP.7)