# Introduction

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As we know, we use 1, 2, 3, 4,... when we begin to count. They come naturally when we start counting. Hence, mathematicians call the counting numbers as **Natural numbers**

The **successor**

The number

We say that the **predecessor**

The number 3 has a **predecessor** and a **successor**. What about 2? The successor is

Does 1 have both a successor and a predecessor?

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We can count the number of children in our school. Similarly, we can also count the number of people in a city, in India and the whole world.

**Can we count the number of stars in the sky ?**

**What about the number of hair strands on our head?**

If we are able to do so, there would be a number for them too. We can then add one more to such a number and get a larger number. In that case we can even write the number of hair on two heads taken together.

It is now perhaps obvious that there is no largest number.

**Apart from these questions shared above, there are many others that can come to our mind when we work with natural numbers.** You can think of a few such questions. You may not clearly know the answers to many of them !