West Virginia College and Career Readiness Standards
WV.M.1.OA. Operations and Algebraic Thinking
Understand and apply properties of operations and the relationship between addition and subtraction.
M.1.4. Understand subtraction as an unknown-addend problem (e.g., subtract 10 – 8 by finding the number that makes 10 when added to 8).
Add and subtract within 20.
M.1.5. Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).
M.1.6. Add and subtract within 20, demonstrating fluency for addition and subtraction within 10 and use strategies such as
M.1.6.a. Counting on.
M.1.6.b. Making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14).
M.1.6.c. Decomposing a number leading to a ten (e.g., 13 – 4 = 13 – 3 – 1 = 10 – 1 = 9).
M.1.6.e. Creating equivalent but easier or known sums (e.g., adding 6 +7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).
WV.M.1.NBT. Number and Operations in Base Ten
Use place value understanding and properties of operations to add and subtract.
M.1.12. Add within 100, including
M.1.12.a. Adding a two-digit number and a one-digit number and adding a two-digit number and a multiple of 10. Relate the strategy to a written method and explain the reasoning used. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones, and sometimes it is necessary to compose a ten.
M.1.12.b. Using concrete models or drawings and strategies based on place value, properties of operations and/or the relationship between addition and subtraction. Relate the strategy to a written method and explain the reasoning used. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones, and sometimes it is necessary to compose a ten.