Missouri Learning Standards
MO.1.NBT. Number Sense and Operations in Base Ten
1.NBT.B. Use place value understanding to add and subtract.
1.NBT.B.5. Add within 100.
MO.1.RA. Relationships and Algebraic Thinking
1.RA.A. Represent and solve problems involving addition and subtraction.
1.RA.A.1. Use addition and subtraction within 20 to solve problems.
1.RA.B. Understand and apply properties of operations and the relationship between addition and subtraction.
1.RA.B.5. Use properties as strategies to add and subtract.
1.RA.B.6. Demonstrate that subtraction can be solved as an unknown-addend problem.
1.RA.C. Add and subtract within 20.
1.RA.C.7. Add and subtract within 20.
1.RA.C.8. Demonstrate fluency with addition and subtraction within 10.