# 3rd Grade Module 1 Terminology

• Terminology

New or Recently Introduced Terms

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

§   Column (e.g., in an array)

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

§   Equal groups (with reference to multiplication and division; one factor is the number of objects in a group and the other is a multiplier that indicates the number of groups)

§   Equation (a statement that 2 expressions are equal.  E.g., 3 x 4 = 12)

§   Distribute (with reference to the Distributive Property; e.g. In 12 x 3 = (10 x 3) + (2 x 3) the 3 is multiplier for each part of the decomposition)

§   Divide/division (partitioning a total into equal groups to show how many equal groups add up to a specific number.  E.g., 15 ÷ 5 = 3)

§   Fact (used to refer to multiplication facts, e.g., 3 x 2)

§   Factors (i.e., numbers that are multiplied to obtain a product)

§   Multiplication/multiply (an operation showing how many times a number is added to itself e.g., 5  5 x 3 =15)

§   Number of groups (factor in a multiplication problem that refers to the total equal groups)

§   Parentheses (e.g., (  ) used around a fact or numbers within an equation)

§   Quotient (the answer when one number is divided by another)

§   Rotate (turn, used with reference to turning arrays 90 degrees)

§   Row/column (in reference to rectangular arrays)

§   Size of groups (factor in a multiplication problem that refers to how many in a group)

§   Unit (i.e., one segment of a partitioned tape diagram)

§   Unknown (i.e., the “missing” factor or quantity in multiplication or division)

Familiar Terms and Symbols

§   Add 1 unit, subtract 1 unit (add or subtract a single unit of two, ten, etc.)

§   Number bond (shows part-part-whole relationship, shown at right)

§   Number sentence (similar to an equation, but not necessarily having equal sides.)

§   Ones, twos, threes, etc. (units of one, two, or three)

§   Repeated addition (adding equal groups together, e.g., 2 + 2 + 2 + 2)

§   Tape Diagram (a method for modeling problems)

§   Value (how much)

 9 × 10
 5 × 10
 4 × 10

 9 × 10
 5 × 10