Terminology 
Definition 
illustration 
array 
a set of numbers or objects that follow a specific pattern, a matrix 




Commutative Property 
changing the order of the factors does not change the product 




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., 3x4=12) 




Distributive Property 
when one of the factors of a product is a sum, multiplying each addend before adding does not change the product 




divide / division 
partitioning a total into equal groups to show how many equal groups add up to a specific number 




fact 
used to refer to multiplication facts 




factors 
the whole numbers that are multiplied to get a product 




multiplication / multiply 
an operation showing how many times a number is added to itself 




number of groups 
factor in a multiplication problem that refers to the total equal groups 




parentheses 
( ) 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 
a horizontal arrangement of numbers or information in an array or table 




column 
a vertical arrangement of numbers or information in an array or table 




size of groups 
factor in a multiplication problem that refers to how many in a group 




unit 
one segment of a partitioned tape diagram 




unknown 
the missing factor or quantity in multiplication or division 
