Number Systems

Type of numbers

N : Natural numbers. They start from 1.   [normal number]W: Whole numbers. They start from 0. (N and zero) [remember, hole? for zero?]Z: Whole numbers and negative integers. (W and -ve numbers) [remember everything so Z]Q: Rational numbers. They are fractions (also include Z because they can be written as W/1) [Remember q for quotient]How to find rational numbers between 2 integers?Example: between 2 and 3 find 6 rational numbers.Denominator is 7 (6+1). What divided by 7 gives 2 and 3?2= 14/73 =21/7Ans:  15/7,16/7,17/7,18/7,19/7,20/7

Irrational Numbers

Irrational if number can't be written as rational (i.e ration or fraction).Ex. √2