## This video lesson is on Algebraic Expressions

### Introduction to CBSE Class 7 Mathematics Chapter "Algebraic Expressions"

The “Algebraic Expressions” chapter in CBSE Class 7 Mathematics is designed to help students understand the building blocks of algebra. It introduces the concept of algebraic expressions, which are combinations of constants, variables, and arithmetic operations (addition, subtraction, multiplication, and division). This chapter breaks down how to form expressions, the terminology involved, like terms, coefficients, and constants, and how to simplify expressions.

Students will explore the addition and subtraction of algebraic expressions, learning to combine like terms and to understand the significance of subtraction as the addition of a negative. The chapter provides a variety of examples and exercises to practice and solidify their understanding of these concepts. By the end of the chapter, students should be comfortable with creating, simplifying, and manipulating algebraic expressions, setting the stage for more advanced topics in algebra.

**Assignments for CBSE Class 7 Mathematics Chapter “Algebraic Expressions”**

**Expression Building**: Create five different algebraic expressions using at least two variables each.**Simplification Race**: Simplify ten algebraic expressions as quickly as possible, ensuring accuracy.**Expression Conversion**: Convert five real-life situations into algebraic expressions.**Like Terms Hunt**: Identify like terms in fifteen different algebraic expressions and explain why they are considered like terms.**Algebraic Art**: Draw a picture using lines and curves and write an algebraic expression to represent each one.

**Conclusion**

“Algebraic Expressions” in CBSE Class 7 Mathematics serves as the alphabet to the language of algebra. Through this chapter, students gain the skills to not only work with mathematical expressions but also to begin solving algebraic equations, which will be crucial in their continued study of mathematics. These foundational concepts are key to developing logical thinking and problem-solving skills that are applicable in many areas of life and study.

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## Questions and Answers for CBSE Class 7 Mathematics Chapter "Algebraic Expressions"

**Q1: What is an algebraic expression?**

**ANS**: An algebraic expression is a mathematical phrase that can contain ordinary numbers, variables (like x or y), and operators (like add, subtract, multiply, and divide).**Q2: What is a coefficient in algebraic expressions?**

**ANS**: A coefficient is a number used to multiply a variable. For example, in 4x, 4 is the coefficient.**Q3: Can algebraic expressions have more than one variable?**

**ANS**: Yes, algebraic expressions can have multiple variables. For example, 2x + 3y is an expression with two variables, x and y.**Q4: What does it mean to simplify an algebraic expression?**

**ANS**: To simplify an algebraic expression means to combine like terms and perform any possible arithmetic to write the expression in the simplest form.**Q5: How do you identify like terms in algebraic expressions?**

**ANS**: Like terms in algebraic expressions are terms that have the exact same variables raised to the same powers. For example, 2x and 5x are like terms.**Q6: Why is it important to learn about algebraic expressions?**

**ANS**: Learning about algebraic expressions is important as it is a fundamental part of algebra, which is used to solve problems in mathematics and various real-life situations.**Q7: How is subtracting algebraic expressions similar to adding them?**

**ANS**: Subtracting algebraic expressions is similar to adding them because subtraction can be seen as the addition of a negative. So, subtracting a term is like adding its opposite.**Q8: What is a constant in an algebraic expression?**

**ANS**: A constant is a value that does not change. In an expression like 3x + 4, the number 4 is a constant.**Q9: Can algebraic expressions be used to model real-world situations?**

**ANS**: Yes, algebraic expressions can represent real-world situations, such as calculating distances, predicting costs, and analyzing rates of change.**Q10: What are the basic operations that can be performed on algebraic expressions?**

**ANS**: The basic operations that can be performed on algebraic expressions include addition, subtraction, multiplication, and division.