Numbers

Natural Numbers
Counting numbers
1
2
3
4
5
Whole Numbers
Natural numbers including zero
0
1
2
3
4
Integers
Whole numbers and their negatives
-2
-1
0
1
2
Rational Numbers
Numbers expressible as fractions
½
¾
1.5
-2.25
0.75
Irrational Numbers
Numbers which cannot be expressed as fractions
π
√2
e
φ
√3
Real Numbers
All numbers on the number line, including rational and irrational numbers
-2
½
π
0
√2