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# CBSE Class 7 Maths Chapter 12 Algebraic Expressions Revision Notes

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## CBSE Class 7 Maths Chapter 12 Algebraic Expressions Revision Notes

If you are looking forward to scoring excellent marks in your Class 7 Maths Exams then it becomes very significant to understand the importance of Revision. Revision is very important as it helps you remember all the important chapters and co-related concepts that you have learned earlier and for the purpose of Revision, Revision Notes are always considered the best as they make your learning easy and convenient.

Chapter 12 of CBSE Class 7 Maths is Algebraic Expressions. Swiflearn offers the best and most reliable CBSE Class 7 Maths Chapter 12 Algebraic Expressions Revision Notes that will make students understand all the important topics & concepts of this chapter and will help them in higher studies also. Free CBSE Class 7 Maths Chapter 12 Algebraic Expressions Revision Notes provided here are prepared under the auspices of our Excellent Teachers keeping in mind the latest CBSE guidelines.

CBSE Class 7 Maths Chapter 12 Algebraic Expressions Revision Notes are one of the most important pieces of study material that students can use as it will make their learning convenient and will also save them a lot of time. Students can download CBSE Class 7 Maths Chapter 12 Algebraic Expressions Revision Notes in PDF format, use them to revise all their previously learned concepts, and hence score better in their exams. ## Algebric Expressions

Introduction

It is a combination of constant and variables kept together through operations like addition, subtraction etc.

Variable

It refers to the unknown quantities that can change or vary. It is generally an English alphabet.

For example: In the expression 4x+5, x is the variable.

Constant

Constant is a quantity which has a fixed value.

For example: in the expression 4x+5, 5 is the constant.

Coefficient

It is a constant value used with the variable.

For example: in the expression 4x+5, 4 is coefficient.

Terms

The different parts of the algebraic expression are separated by the fundamental operations.

For example: in the expression 4x+5, ‘4x’ and ‘5’ the terms

Like terms

Terms which contain same variables are called like terms

For example: 6pq and 2pq are like terms

Unlike terms

Terms having different variables are called unlike terms.
For example: 4x and -2y are unlike terms.

#### Types of Algebraic expression:

Monomial Expression

An algebraic expression containing only one term is known as a monomial.

For example

2×4, 2xy, etc.

Binomial Expression

A binomial expression has two unlike terms

For examples

2xy + 4, xyz + x2, etc.

Polynomial Expression

In general, an expression with more than one terms with non-negative integral exponents of a variable is known as a polynomial.

Examples

ab + bc + ca,  etc.

### Addition and Subtraction of Algebraic Expression

Addition and Subtraction of like terms

Like terms can be added or subtracted by simply adding or subtracting the coefficients of the terms.

For example: 5x + 3x = 8x    ,    5x – 3x = 2x

Addition and Subtraction of unlike terms

We write the unlike terms with the sign of addition and subtraction.

For example:  adding 6x, 17y, 5

Result will be 6x+17y+5

Subtracting 7x from 3y

Result will be 3y-7x

#### Finding the Value of an Expression

Finding the numerical value of given expression.

Value of variable is given here.

Example: Find the value of 7x + y, given x=2, y=6

7x + y = 7(2) + 6 = 14 + 6 = 20

### CBSE Class 7 Maths Chapter 12 Algebraic Expressions Revision Notes PDF 