Common Core Alignment:.

1.OA.5:

Operations And Algebraic Thinking

Add And Subtract Within 20.

Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).

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.

3.NBT.2:

Number And Operations In Base Ten

Use Place Value Understanding And Properties Of Operations To Perform Multi-Digit Arithmetic

Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and-or the relationship between addition and subtraction.