### Mathematics Class VI

Knowing Our Numbers
Whole Numbers
Playing With Numbers
Basic Geometrical Ideas
Fractions
Integers
Decimals
Data Handling
Mensuration
Algebra
Ratio and Proportion
Practical Geometry
Symmetry

# Introduction

A number is defined as an arithmetical value.

## Types of Numbers

• Prime numbers
• Even numbers
• Odd numbers
• Whole numbers
• Natural numbers
• Composite numbers

Perfect number: Perfect number is a number in which sum of all the factors of the number is equal to twice the number.

For example: 28 is a perfect number because all the factors of 28 are 1,2,4,7,14 and 28 whose sum , whereas 10 is not a perfect number because all the factors of 10 are 1, 2, 5 and 10 whose sum

Even number: A number which is divisible by 2 is called an even number.
For example: 2, 4, 6, 8, 10….

Odd number: A number which is not divisible by 2 is called an odd number.
For example: 1, 3, 5, 7, 9, …

A number with 0, 2, 4, 6, 8 at the unit’s place is an even number.
So, 250, 2732, 29354, 34596 are even numbers.
Obviously, the numbers 257, 3249, 7321 are odd numbers.

• 2 is the smallest prime number which is even.
• Every prime number except 2 is odd.
• In this chapter, we will also learn about HCF, LCM, prime factorization, and their properties in detail.
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