Introduction

In this chapter, we will learn about numbers. The numbers are used to count. With numbers, we can perform operations like addition, subtraction, multiplication, and division.

Before going into the sums and the solutions we need to conceptually understand the chapter. It is always better to understand a chapter conceptually so that we can understand every sum and that in turn makes it easier for us to solve the sum. Let us just go through some basic concepts related to numbers. There are {10} numbers in totality which are; {0,1,2,3,4,5,6,7,8,9} . We also need to understand the conversion of different units of numbers into others. For example, how many lakhs make a crore or how many lakhs make a million. We also need to understand the meaning of place value to be able to do the sums without any problems. Another type of sum that we get is when we need to identify the smallest and the largest numbers. The number which has more digits is the largest and vice versa. While we are talking about numbers, we need to properly understand the concept of Roman numerals as they are also used in a variety of mathematic sums. The image below should give you a clearer image of Roman numerals.

We also need to understand how to estimate and round off numbers with respect to the question.

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