# 3rd Grade Module 4 Terminology

• Terminology

New or Recently Introduced Terms

§   Area (the amount of two-dimensional space in a bounded region)

§   Area model (a model for multiplication that relates rectangular arrays to area)

§   Square unit (a unit of area—specifically square centimeters, inches, feet, and meters)

§   Tile (to cover a region without gaps or overlaps)

§   Unit square (e.g., given a length unit, it is a 1 unit by 1 unit square)

§   Whole number (an integer, a number without fractions)

Familiar Terms and Symbols

§   Array (a set of numbers or objects that follow a specific pattern, a matrix)

§   Commutative Property (e.g., rotate a rectangular array 90 degrees to demonstrate that factors in a multiplication sentence can switch places)

§   Distribute (e.g., 2 × (3 + 4) = 2 × 3 + 2 × 4)

§   Geometric shape (a two-dimensional object with a specific outline or form)

§   Length (the straight-line distance between two points)

§   Multiplication (e.g., 5 × 3 =15)

§   Rows and columns (e.g., in reference to rectangular arrays)

Suggested Tools and Representations

§   Area model

§   Array

§   Grid paper (inch and centimeter)

§   Rulers (both centimeter and inch measurements)

§   Unit squares in both inch and centimeter lengths (e.g., square tiles used for measuring area)