7th and 8th Grade PSSA Vocabulary

An integer greater than one whose only positive factors are 1 and itself.

(e.g. 2,3,5,7,11,13,17,19

Any positive integer exactly divisible by one or more positive integers other than itself and 1.

The number or variable multiplied in a multiplication expression.

A number that is the product of a given integer and another integer

(e.g. 6 and 9 are multiples of 3

Rules for evaluating an expression:
work first within parentheses
then calculate all powers, left to right,
then do multiplications or divisions
then do additions and subtractions, left to right.

The product of an integer multiplied by itself

(e.g. 121 is a perfect square because 11X11= 121

A comparison of two numbers by division

An equation of the form a/b= c/d that states that the two ratios are equivalent

Different forms of numbers that name the same number

(e,g, fraction, decimal, percent as 1/2, .5, 50%

Involves writing the numbers that name the same number

(e.g.15,629 +10,000+5,000+600+20+9)

A form of writing very large or very small numbers using a number greater or equal to 1 and less than 10 multiplied by a power of 10 (e.g., 4.7X10 = 4,700,000,000

Any number that can be written in the form a/b where a is an integer and b is any integer except zero

A number that cannot be written as a simple fraction. It is an infinite and non -repeating decimal.

The set consisting of all rational numbers and all irrational numbers