However, I can provide a general overview of rational numbers and some potential topics that may be covered in a Class 8 math textbook:

Introduction to Rational Numbers:
- Definition of rational numbers as numbers that can be expressed as a fraction of two integers
- Examples of rational numbers
- Comparison of rational numbers with whole numbers, integers, and irrational numbers

Representation of Rational Numbers:
- Representation of rational numbers on a number line
- Conversion of rational numbers between decimals and fractions
- Simplification of fractions to lowest terms

Operations with Rational Numbers:
- Addition, subtraction, multiplication, and division of rational numbers
- Simplification of expressions with rational numbers
- Word problems involving rational numbers

Properties of Rational Numbers:
- Commutative, associative, and distributive properties of addition and multiplication with rational numbers
- Identity and inverse elements for addition and multiplication with rational numbers
- Closure property of rational numbers under addition, subtraction, multiplication, and division

Applications of Rational Numbers:
- Ratios and proportions involving rational numbers
- Percentages involving rational numbers
- Measurement and geometry problems involving rational numbers

Conclusion:
In conclusion, the study of rational numbers is an important topic in Class 8 math that lays the foundation for further concepts in algebra, geometry, and other branches of mathematics. By understanding the representation, operations, properties, and applications of rational numbers, students can develop critical thinking skills and problem-solving abilities that will serve them well in their academic and professional careers.