CBSE Notes Class 7 Maths Chapter 1 Integers

Chapter 1 of CBSE Class 7 Maths Integers, introduces students to the extended number system, including positive and negative numbers along with zero. This chapter builds on the concept of whole numbers and expands students' understanding by incorporating negative values to represent real-world scenarios such as temperatures below zero or financial losses.

Students will learn the properties of integers, including operations like addition, subtraction, multiplication, and division. The chapter also emphasizes important concepts like the commutative, associative, and distributive properties, which simplify calculations involving integers. Through this chapter, learners develop the ability to handle both positive and negative values effectively, which is essential for higher-level mathematics.

1.0Download CBSE Class 7 Maths Chapter 1 Integers: Free PDF

Get started with your CBSE Class 7 Maths preparation by downloading the free PDF notes for Chapter 1 Integers. These notes are created based on the latest CBSE syllabus and are perfect for understanding basic concepts, solving problems, and building a strong foundation in Maths.

Class 7 Maths Chapter 1 Revision Notes:

2.0Natural Numbers

Counting numbers 1, 2, 3, 4, 5, and so on are called natural numbers. The collection of natural numbers is expressed as N = {1, 2, 3, 4, 5,....}

3.0Whole Numbers

When 0 is included with the natural numbers, the resulting set is called whole numbers. It is represented as W = {0, 1, 2, 3, 4, 5,....}

4.0Integers

Integers include all counting numbers, their negatives, and zero. The set of integers is represented as Z or I = {....., –4, –3, –2, –1, 0, 1, 2, 3, 4,......}

Positive Integers : The set of all positive integers is denoted as I+ = {1, 2, 3, 4,....}. Positive integers are essentially the same as natural numbers.
Negative Integers : The set I–= {....., –3, –2, –1} is the set of all negative integers. 0 is neither positive nor negative.

5.0Representation of Integers on Number Line

The number line representing the integers is given below

Representation of integers in a number line

Addition of Integers on the Number Line :

Rule 1: When we add two positive integers, we add their values, and the result will take the positive sign (Common sign of both the integers)

Rule 2: When we add a positive and a negative integer, we find the difference of their numerical values, regardless of their signs and give the sign of the integer which is greater.

Subtraction of integers on the number Line

Subtract the numbers 5 – (+6) by using the number line.

Explanation

Subtraction is just an addition. When we change the operation from subtraction to addition, we need to use the opposite sign for the number that follows. This allows us to rewrite the expression as: 5 – (+6) ⇒ 5 + (–6)

We start at the first number, 5 and move 6 units towards the left side.

6.0Properties of Addition of Integers

Closure property of addition: The sum of any two integers will always be an integer.
Commutative law of addition: For any two integers a and b the equation a + b = b + a holds true.
Associative law of addition: For any three integers a, b, c the equation (a + b) + c = a + (b + c) is valid.
Existence of additive identity: For any integer a, we have: a + 0 = 0 + a = a. 0 is called the additive identity for integers.
Existence of additive inverse: For any integer a, we have: a + (–a) = (–a) + a = 0. The opposite of an integer a is (–a). The sum of an integer and its opposite is 0. Additive inverse of a is (–a).

7.0Properties of Subtraction of Integers

Closure property for subtraction: If a and b are any 2 integers, then (a – b) is always an integer.
Subtraction of integers is not commutative

8.0Properties of Multiplication of Integers

Closure property for multiplication: The product of any two integers is always an integer.
Commutative law for multiplication: For any 2 integers a and b, (a × b) = (b × a)
Associative law for multiplication: For any 3 integers a, b, c, (a × b) × c = a × (b × c)
Distributive law for multiplication over addition: For any integers a, b, c, a × (b + c) = (a × b) + (a × c)
Distributive of multiplication over Subtraction: If a, b and c are 3 integers, then a × (b – c) = (a × b) – (a × c)
Existence of multiplicative identity: For every integer a, we have: (a × 1) = (1× a) = a

The number 1 is referred to as the multiplicative identity for integers.

Existence of multiplicative inverse: Multiplicative inverse of a non-zero integer 'a' is the number $\frac{1}{a}$ , as a $\times (\frac{1}{a}) = (\frac{1}{a}) \times a = 1$
Property of zero

For every integer a, we have: (a × 0) = (0 × a) = 0

9.0Properties and Operation of Division

Rule 1: For dividing one integer by the other, the two having unlike signs, we divide their values regardless of their signs and give a minus sign to the quotient.

Rule 2: For dividing one integer by the other having like signs, we divide their values regardless of their signs and give a plus sign to the quotient.

Division	Resultant Sign	Example
(+) ÷ (+)	+	9 ÷ 3 = 3
(–) ÷ (–)	–	(–9) ÷ (–3) = 3
(+) ÷ (–)	–	(+9) ÷ (–3) = –3
(–) ÷ (+)	–	(–9) ÷ (+3) = –3

10.0Properties of Division of Integers

For integers a and b, then (a ÷ b) is not always an integer.
If a is a non-zero integer, then a ÷ a = 1
If a is an integer, then (a ÷ 1) = a
If a is a non-zero integer, then (0 ÷ a) = 0 but (a ÷ 0) is undefined.
If a, b, c are integers, then (a ÷ b) ÷ c ≠ a ÷ (b ÷ c), unless c = 1 Thus, division of integers is not associative.

11.0Mind Map for Integers

12.0Sample Question for Integers

What is the smallest and largest integer?

Ans: Integers extend infinitely in both the positive and negative directions. Hence, there is no smallest or largest integer. We can write:

$- \infty < I < + \infty$

13.0Key Features of CBSE Class 7 Maths Notes Chapter 1 Integers

Simplified Explanations: Concepts like positive and negative integers, number line representation, and operations on integers are explained in an easy-to-understand manner.
NCERT-Aligned Content: Notes are strictly based on the latest NCERT Solutions syllabus and guidelines to help students stay exam-ready.
Visual Aids & Examples: Includes diagrams and solved examples to visually represent key concepts and enhance conceptual clarity.
Topic-Wise Breakdown: Each sub-topic is covered individually, including properties of addition and subtraction of integers, for better focus and understanding.
Quick Revision Format: Designed for fast revision before exams or class tests with bullet points and summarized key points.
Practice Support: Important formulas and concepts are highlighted for quick recall and better problem-solving.
Accessible Anytime: Available in downloadable PDF format, so students can study anytime, even without an internet connection.