# CBSE Class 7 Maths Revision Notes Chapter 12

## CBSE Class 7 Mathematics Chapter 12 Revision Notes – Algebraic Expressions

To help the students understand the key concepts of “Algebraic Expressions”, the experts at Extramarks have specially curated the Class 7 Mathematics Chapter 12 Revision Notes. Subject experts have drafted the revision notes in accordance with the CBSE guidelines and syllabus.

Chapter 12 Algebraic expressions emphasise the formation of expressions. In Class 6th, students learn to formulate problems and puzzles with algebraic expressions. This forms the basis of studying further concepts and topics in Algebraic expressions. In Class 7th, students will know the importance of expressions for learning algebra. The chapter covers 4 exercises and 8 sections. It will enable students to know the formation of expressions, a combination of expressions, finding the values of algebraic expressions, using algebraic expressions, etc.

Moreover, by regularly revising the Class 7 Mathematics Chapter 12 Revision Notes, the students can secure good marks in their exams. To make it more convenient for the students, the language used in the notes is simple and easy to understand. An ample number of examples, along with key definitions, have been added to help students better understand the Class 7 Mathematics Chapter 12 Revision Notes. Thus, to improve their understanding, the candidates are advised to regularly revise the Class 7 Mathematics Chapter 12 Notes along with the NCERT books.

### About Class 7 Chapter 12 Algebraic Expression

Variables and constants are the building blocks of algebraic expressions. Expressions are created by applying addition, subtraction, multiplication, and division operations to the variables and constants.

There are different types of algebraic expressions.

• A polynomial is any expression with one or more terms.
• An expression with one term is referred to as a monomial.
• An expression with two terms is referred to as a binomial.
• An expression with three terms is referred to as a trinomial.

## Addition And Subtraction Of Algebraic Expressions:

• While adding like terms together, the result is equal to the sum of all the coefficients of like terms.

For example: 2xy + 3 xy = (2+3) xy = 5xy

• When like terms are subtracted, the result is equal to the deduction or difference of all the coefficients of like terms.

For example: 2xy – 3xy = (2-3)xy = -xy

• Like the like terms, we cannot subtract or add, terms.
• On either subtracting or adding two algebraic expressions, the, unlike terms, remain as it is while the like terms are put together. Thereafter, the required operation is performed.

### For example: If you add two expressions i.e.

(6X+26+18xy) and (10xy-16z-4x), then it will be:

(6X+26+18xy) + (10xy-16z-4x)

= (18+10)xy + (6-4)x + 26 – 16z

= 28xy+2x-16z+26

### Key Features of Extramarks Class 7 Mathematics Chapter 12 Revision Notes – Algebraic Expressions

The Class 7 Mathematics Chapter 12 Revision Notes will help the students understand the key concepts of the important chapter “Algebraic Expressions” better. The notes drafted are comprehensive and follow the CBSE guidelines.

The key features of the Extramarks Class 7 Mathematics Chapter 12 Revision Notes are as follows.

• The language used is lucid and easy to understand.
• The notes are prepared in accordance with the latest guidelines.
• To substantiate the points, an ample number of examples are used.
• All the key points have been discussed in the Class 7 Mathematics Chapter 12 Revision Notes.
• The notes have been specially curated by the subject experts at Extramarks.

### 1. Is it essential to learn and practise all the concepts under “Algebraic Expression”?

You must learn the answers to every question in Class 7 Mathematics Chapter 12 Revision Notes because both class tests and board exams may contain these questions. The students thus need to be prepared for their future exams by going through these questions.

### 2. What are the key topics that need to be covered?

The key topics that need to be covered in this chapter are as follows.

• How are expressions formed?
• Terms of an expression
• Like and unlike terms
• Monomials
• Binomial
• Trinomials
• Polynomials
• Addition and subtraction of algebraic expressions
• Finding the value of an expression and using algebraic expressions
• Formulas and rules

### 3. What are the different types of algebraic expressions?

Following are the types of algebraic expressions:

• A polynomial is any expression with one or more terms.
• An expression with one term is referred to as a monomial.
• An expression with two terms is referred to as a binomial.
• An expression with three terms is referred to as a trinomial.

### 4. How to access the class 7 Mathematics revision notes for chapter 12?

You can access the notes with the Extramarks website. Experts at Extramarks have specially curated the Class 7 Mathematics Chapter 12 Revision Notes in order to help students understand the key concepts of “Algebraic Expressions”.

### 5. What weightage does chapter 12 Algebraic Expressions hold in class 7 Mathematics exam?

This particular chapter holds significant weightage from the exam point of view as per the CBSE structure. In order to score better marks on the exam, you must prepare well for this chapter.