K.OA.1:
Operations And Algebraic Thinking
Understand Addition As Putting Together And Adding To, And Under- Stand Subtraction As Taking Apart And Taking From.
Represent addition and subtraction with objects, fingers, mental images, drawings2, sounds (e.g., claps), acting out situations, verbal explanations, expressions, or equations.
K.OA.2:
Operations And Algebraic Thinking
Understand Addition As Putting Together And Adding To, And Under- Stand Subtraction As Taking Apart And Taking From.
Solve addition and subtraction word problems, and add and subtract within 10, e.g., by using objects or drawings to represent the problem.
K.OA.5:
Operations And Algebraic Thinking
Understand Addition As Putting Together And Adding To, And Under- Stand Subtraction As Taking Apart And Taking From.
Fluently add and subtract within 5.
1.OA.6:
Operations And Algebraic Thinking
Add And Subtract Within 20.
Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 - 4 = 13 - 3 - 1 = 10 - 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 - 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).
1.OA.8:
Operations And Algebraic Thinking
Work With Addition And Subtraction Equations.
Determine the unknown whole number in an addition or subtraction equation relating three whole numbers. For example, determine the unknown number that makes the equation true in each of the equations 8 + ? = 11, 5 = ? - 3, 6 + 6 = ?.
2.OA.2:
Operations And Algebraic Thinking
Add And Subtract Within 20.
Fluently add and subtract within 20 using mental strategies.2 By end of Grade 2, know from memory all sums of two one-digit numbers.
2.NBT.5:
Number And Operations In Base Ten
Use Place Value Understanding And Properties Of Operations To Add And Subtract.
Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
