### 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

Whole Numbers

Whole numbers include all-natural numbers and zero

i.e., 0, 1, 2, 3, 4, and so on.

Negative Numbers

• The numbers lying to the left of the zero with negative sign on the numbers line are called negative numbers.

The Number Line

Integers

• Set of all positive and negative numbers including zero are called integers.

…, – 4, – 3, – 2, – 1, 0, 1, 2, 3, 4, … are integers.

Representing Integers on the Number Line

Absolute value of an integer

• When we consider only the numerical value of the integer without considering its sign it is called as the absolute value of an integer.
• Example: Absolute value of -7 is 7 and of +7 is 7.

Ordering Integers

• The number increases as we move towards right and decreases as we move towards left on a number line.
• Hence, the order of integers is …, –5, –4, – 3, – 2, – 1, 0, 1, 2, 3, 4, 5…

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