equal groups - groups that have the same number of items, multiplication - an operation that gives the total number when you join equal groups, factors - numbers that are multiplied together to give a product, product - the answer to a multiplication problem, equation - a number sentence that uses an equal sign to show that the value on its left side is the same as the value on its right side, unknown - a symbol that stands for a number in an equation, number line - a line that shows numbers in order using a scale, array - a way of displaying objects in equal rows and columns, row - an arrangement of objects or numbers, one to the side of another, column - an arrangement of objects or numbers, one above another, commutative property of multiplication - numbers can be multiplied in any order and the product will be the same, division - an operation that tells how many equal groups there are or how many are in each group,

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