Page 1 - Lesson Note

SAI International School
CLASS-VI

Mathematics
CHAPTER-6: Integers
LESSON NOTES-1

SUBTOPIC: Introduction, Repressing integers on number line and
Absolute value of an integer

Introduction:

 Natural numbers are 1, 2, 3, 4,5 and so on. If we include zero to the collection
then the numbers are known as whole numbers, that is, 0, 1, 2, 3, 4 and so
on.
 There are negative numbers also exist. If we put the whole numbers and the
negative numbers together, the new collection of numbers will look like -4,-3,-
2,-1, 0, 1,2,3,4 and so on. This collection of numbers is known as Integers.
 In this collection, numbers above zero - 1, 2, 3...are said to be positive
integers and numbers below zero – 1, – 2, – 3 ... are said to be negative
integers.

Integers in a Number Line:

The integers are represented on the number line in the following way:

 The numbers to the left of zero are negative integers while numbers to the
right of zero are positive integers.
 While drawing a number line keeping arrow mark both the side of the line is
compulsory.

Ex- To mark -6 and +2 in a number line.

 Draw a line and mark some points at equal distance on it as shown in the
figure. Mark a point as zero on it.
 In order to mark – 6 on this line, we move 6 points to the left of zero.