Class 6 Chapter 8: Introduction to Algebra

Important Concepts and Formulas

1.      A symbol that can take different values is called a variable.

2.      A symbol having a fixed numerical value is called a constant.

3.      An algebraic expression is a mathematical expression which contain variables, constant and mathematical operators such as +, –, × and ÷.

4.      The signs ‘+’ and ‘–’ separate the expression into various parts. These parts are called terms.

5.      When terms have the same variables and if the powers of the variables are same, then they are called like terms, else they are unlike terms.

6.      The numerical coefficient of a term in an algebraic expression is the number by which the term is multiplied.

7.      Like terms can be combined to make a single term.

8.      We can evaluate an algebraic expression for given values of the variables.