<P> Scientific notation: A method for writing very small and very large numbers using powers of 10 . When used in science, such a number also conveys the precision of measurement using significant figures . </P> <P> Knuth's up - arrow notation and Conway chained arrow notation: Notations that allow the concise representation of extremely large integers such as Graham's number . </P> <P> Positive real numbers: Real numbers that are greater than zero . </P> <P> Negative numbers: Real numbers that are less than zero . Because zero itself has no sign, neither the positive numbers nor the negative numbers include zero . When zero is a possibility, the following terms are often used: </P>

What are whole natural integer rational irrational numbers