Accessable NCERT Class 6 Mathematics Text Book for Low Vision Students.

We have seen that the number 1 has no predecessor in natural numbers. To the collection of natural numbers we add zero as the predecessor for 1.

The natural numbers along with zero form the collection of whole numbers.

In your previous classes you have learnt to perform all the basic operations like addition,
subtraction, multiplication and division on numbers. You also know how to apply them to
problems. Let us try them on a number line. Before we proceed, let us find out what a number line is!

Help yourself

1. Are all natural numbers also whole numbers?
2. Are all whole numbers also natural numbers?
3. Which is the greatest whole number?