Numbers

Whole Numbers

• A number that isn’t a fraction.
• Nor a decimal
• Isn’t negative
• 0, 1, 2, 3 ......

Natural Numbers

• Whole numbers > 0
• Some people call them the “counting numbers”
• 1, 2, 3, 4 .....

Integers

• All whole numbers (no decimal, nor fraction bits)
• &
• Negatives too

Rational Numbers

• Anything that can be written as a simple fraction or ratio
• All integers
• All whole numbers
• 1/2 (.5), 0.25 = 1/4, 4.12 or 412/100, 1/3 or 0.333....
• 3/2 = 1.5

Irrational numbers

• Can't express as a fraction
• The decimal goes on forever without repeating
• Root of 2
• Pi = 3.14 ...... We can’t write a simple fraction that equals pi.
• Roots of 3 and 99

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