Ans. The odd numbers are the whole numbers which are not divisible into pairs. When the odd numbers are divided by 2 then they leave a remainder of 1. Odd numbers have some digits such as 1, 3, 5, 7 or 9 in their one's place. Numbers like 1, 3, 5, 7, 9, 11, 13, and 15 and so on are the sequential odd numbers.