counting numbers (1 to infinity)
Natural
natural numbers and zero (0 to infinity)
Whole
natural numbers, whole numbers, and negatives (…,-1,0,1…)
Integers
fractions and decimals; repeating or terminating
(1/2, 0.67, 2.3)
Rational
decimals don’t terminate or repeat ( π)
Irrational
Natural symbol
N
Whole symbol
W
Integers symbol
Z
Rational symbol
Q
Irrational symbol
I