Types of Numbers

Front

Rational Numbers

Back

Numbers that can be written as a fraction

(like ½, 3, or –4).

Their decimals either stop (0.25) or repeat (0.333…).

Front

Irrational Numbers

Back

Numbers that cannot be written as a fraction. Their decimals go on forever without repeating (like π or √2).

Front

Real Numbers

Back

All the numbers you normally use: rational and irrational numbers (fractions, decimals, positives, negatives, square roots, etc.).

Front

Natural Numbers

Back

The 'counting numbers': 1, 2, 3, 4, 5, …

Front

Whole Numbers

Back

Like natural numbers, but they also include 0: 0, 1, 2, 3, 4, …

Front

Integers

Back

Whole numbers and their negatives: … –3, –2, –1, 0, 1, 2, 3 …

Front

Decimal

Back

A number with a decimal point, showing parts of a whole (like 3.5 or 0.72).

Front

• X-intercept

Back

• The point where a graph crosses the x-axis. It’s where the y-value is 0.

Front

• Y-intercept

Back

• The point where a graph crosses the y-axis. It’s where the x-value is 0.

Front

• Origin

Back

• The point (0, 0) where the x-axis and y-axis cross in the coordinate plane