### 3rd Grade, Activity 54: Understand Properties of Multiplication and the Relationship Between Multiplication and Division

Understand division as an unknown-factor problem. For example, find 32 Ă· 8 by finding the number that makes 32 when multiplied by 8.

### 2nd Grade, Activity 376: Reason with Shapes and their Attributes

Partition circles and rectangles into two, three, or four equal shares, describe the shares using the words halves, thirds, half of, a third of, etc., and describe the whole as two halves, three thirds, four fourths. Recognize that equal shares of identical wholes need not have the same shape.

### 2nd Grade, Activity 345: 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.

### 2nd Grade, Activity 184: 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.

### 2nd Grade, Activity 163: Understand Place Value

Read and write numbers to 1000 using base-ten numerals, number names, and expanded form.

### 2nd Grade, Activity 138: Understand Place Value

Read and write numbers to 1000 using base-ten numerals, number names, and expanded form.

### 2nd Grade, Activity 13: Represent and Solve Problems Involving Addition and Subtractionâ€‹

Use addition and subtraction within 100 to solve one-and two-step word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem.