Class 6 · Chapter 11
Algebra
Introduction to variables and constants; algebraic expressions; forming and solving simple equations.
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Detailed theory
A letter (like or ) that represents a number is a variable. Variables let us express general rules: 'a number plus 5' becomes .
Key concepts & formulas
01
A variable is a letter that can take different values (e.g. ).
02
A constant has a fixed value.
03
An algebraic expression combines variables, constants and operations.
04
An equation has an equal sign; solving finds the value of the variable.
05
Rules of arithmetic operations extend to expressions.