# Introduction

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Counting things is easy for us now. We can count objects in large numbers, for example, the *number of students in the school*, and represent them through **numerals**. We can also communicate large numbers using suitable

It is not as if we always knew how to convey large quantities in conversation or through **symbols**.

Many thousands of years ago, people knew only small numbers. Gradually, they learnt how to handle larger numbers. They also learnt how to express **large numbers** in

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All this came through collective efforts of human beings.Their path was not easy, they struggled all along the way. In fact, the **development of whole of Mathematics** can be understood this way. As **human beings progressed**, there was **greater need for development of Mathematics** and as a result Mathematics grew further and

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We use numbers and know many things about them. Numbers help us **which collection of objects is bigger and arrange them in order** e.g., **first**, **second**, etc. Numbers are used in many different contexts and in many ways.

Think about various situations where we use numbers.

We enjoyed **working with numbers** earlier. We have **added, subtracted, multiplied and divided** them. We also looked for **patterns in number sequences** and done many other interesting things with numbers. In this chapter, we shall move forward on such interesting things with a bit of review and revision as well.