Reveal Math Grade 8 Module 2 Vocab

Front

Bar Notation

Back

In repeating decimals, the line or bar placed over the digits that repeat.

Front

Counterexample

Back

A statement or example that shows a conjecture is false. For instance:

Examples of negative numbers are:

-4, -6.5 or -1/3

Counterexamples:

16, 3 or 1/2

Front

Cube Root

Back

One of three equal factors of a number.

If a³ = b, then a is the cube root of b.

Example: The cube root of 64 is 4 since 4³ = 64.

Front

Integers

Back

The set of WHOLE numbers and their opposites.

Front

Inverse Operations

Back

Pairs of operations that undo each other.

Addition & Subtraction are inverse operations.

7 + 3 = 10

7 = 10 - 3

Multiplication & Division are inverse operations.

2 x 5 = 10

10 / 2 = 5

Front

Irrational Number

Back

A number that cannot be expressed as a ratio (fraction),  where a and b are integers and b ≠ 0.

Front

Natural Numbers

Back

The set of numbers used for counting.

Front

Perfect Cube

Back

A  number whose cube root is an integer.

Example: 27 is a perfect cube because its cube root is 3.

Front

Perfect Square

Back

A number whose square root is a whole number.

Example: 25 is a perfect square because its square root is 5.