5.Operations on Rational Numbers Natural numbers: The groups of the positive numbers which are countable are known as natural numbers. The examples of natural numbers will be 1, 2, 3, 4, 5, etc. On solving equations like x + 3 = 12, we get the solution as x = 9. The solution 9 is a natural number. Whole numbers: The groups of natural numbers with inclusion of zero in it are known as whole numbers. The examples of whole numbers will be 0, 1, 2, 3, 4, 5, etc. On solving equations like x + 7 = 7, we get the solution as x = 0. The solution 0 is a whole number. For the given equation, if we would have considered only the natural numbers, then we could not have found the solution. By adding zero to group of natural numbers we get the whole numbers. Integers: The groups of positive and negative numbers along with zero are known as integer numbers. The examples of integer numbers will be -3, -2, -1, 0, 1, 2, 3, 4, 5, etc. On solving equations like x + 12 = 7, we get ...