Common Core Alignment:.

1.OA.3:

Operations And Algebraic Thinking

Understand And Apply Properties Of Operations And The Relationship Between Addition And Subtraction.

Apply properties of operations as strategies to add and subtract.3 Examples: If 8 + 3 = 11 is known, then 3 + 8 = 11 is also known. (Commutative property of addition.) To add 2 + 6 + 4, the second two numbers can be added to make a ten, so 2 + 6 + 4 = 2 + 10 = 12. (Associative property of addition.)

1.OA.4:

Operations And Algebraic Thinking

Understand And Apply Properties Of Operations And The Relationship Between Addition And Subtraction.

Understand subtraction as an unknown-addend problem. For example, subtract 10 - 8 by finding the number that makes 10 when added to 8.

2.G.1:

Geometry

Reason With Shapes And Their Attributes.

Recognize and draw shapes having specified attributes, such as a given number of angles or a given number of equal faces.5 Identify triangles, quadrilaterals, pentagons, hexagons, and cubes.

2.MD.8:

Measurement And Data

Work With Time And Money.

Solve word problems involving dollar bills, quarters, dimes, nickels, and pennies, using $ and c symbols appropriately. Example: If you have 2 dimes and 3 pennies, how many cents do you have?

2.NBT.9:

Number And Operations In Base Ten

Use Place Value Understanding And Properties Of Operations To Add And Subtract.

Explain why addition and subtraction strategies work, using place value and the properties of operations.3

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.MD.1:

Measurement And Data

Solve Problems Involving Measurement And Estimation Of Intervals Of Time, Liquid Volumes, And Masses Of Objects.

Tell and write time to the nearest minute and measure time intervals in minutes. Solve word problems involving addition and subtraction of time intervals in minutes, e.g., by representing the problem on a number line diagram.