Whole Numbers All natural numbers together with zero form the collection of all whole numbers. It is denoted by "W" W = { 0,1,2,3,4,5,6,7,8,9,10, ............... } Type of Whole Numbers 1. Even Numbers 2. Odd Numbers 1. Even Numbers A number which is divisible by 2, it is called even number. It is denoted by "E". E = { 0,2,4,6,8,10,12,14,16,18,20, ........ } 2. Odd Numbers A number which is not divisible by 2, it is called odd number. It is denoted by "O". O = { 1,3,5,7,9,11,13,,15,17,19,21, ....... } We can understand whole numbers from a picture