## The journey into the intriguing world of numbers continues with CBSE Class 10 Mathematics chapter "Real Numbers." This foundational chapter is a gateway to advanced mathematical concepts and applications.

### Introduction to CBSE Class 10 Mathematics Chapter "Real Numbers"

“Real Numbers” forms the bedrock of Class 10 Mathematics, expanding on the number system that students have been familiarized with in earlier classes. The chapter begins by revisiting the basics—classifying numbers into various categories such as natural numbers, whole numbers, integers, and rational numbers. It then introduces the idea of irrational numbers, thus completing the collection of real numbers.

The students explore the fundamental theorem of arithmetic, which states that every composite number can be expressed as a product of primes, and this factorization is unique, apart from the order. This theorem is significant in the simplification of roots and in understanding the structure of numbers.

The chapter also delves into the concepts of Euclid’s division lemma, which is a technique used to generate the HCF (Highest Common Factor) of two given numbers. Furthermore, it examines the relationship between HCF and LCM (Least Common Multiple), and the method of finding LCM by the HCF and vice versa.

The concluding sections of the chapter address the decimal representation of rational numbers, identifying whether a given decimal is terminating or non-terminating and recurring. Through this chapter, students strengthen their comprehension and operational skills with real numbers, an essential part of mathematics.

**Assignments for CBSE Class 10 Mathematics Chapter “Real Numbers”**

**Prime Factorization**: Factorize different composite numbers into their prime factors and identify their uniqueness.**Applying Euclid’s Lemma**: Use Euclid’s division lemma to find the HCF of pairs of numbers.**Exploring Irrational Numbers**: Identify and explain examples of irrational numbers, including the exploration of their decimal expansions.**LCM and HCF Relationship**: Solve problems that involve finding one from the other using the relationship between LCM and HCF.**Decimal Expansion Classification**: Classify a list of given decimal numbers as terminating or non-terminating recurring decimals.

**Conclusion**

“Real Numbers” is a crucial chapter that sets the tone for high-level mathematics in CBSE Class 10. It not only enhances students’ understanding of the number system but also sharpens their problem-solving skills, paving the way for more complex and abstract mathematical studies.

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## Questions and Answers for CBSE Class 10 Mathematics Chapter "Real Numbers"

**Q1: What are real numbers?**

**ANS**: Real numbers include all the rational and irrational numbers, encompassing every number that can be found on the number line.**Q2: How is the fundamental theorem of arithmetic useful?**

**ANS**: It is useful in simplifying mathematical operations involving prime factorization and proving the uniqueness of such factorizations.**Q3: What is Euclid’s division lemma?**

**ANS**: Euclid’s division lemma states that for any two positive integers ‘a’ and ‘b’, there exist unique integers ‘q’ and ‘r’ such that a = bq + r, where 0 ≤ r < b.**Q4: How do you calculate the LCM of two numbers?**

**ANS**: LCM of two numbers can be calculated by multiplying the highest powers of all the primes that appear in the prime factorization of these numbers.**Q5: What is the difference between a terminating decimal and a non-terminating recurring decimal?**

**ANS**: A terminating decimal has a finite number of digits after the decimal point, while a non-terminating recurring decimal has an infinite number of digits that repeat in a pattern.**Q6: Can irrational numbers be expressed as fractions?**

**ANS**: No, irrational numbers cannot be expressed as fractions or ratios of integers; their decimal expansions are non-terminating and non-recurring.**Q7: What is the significance of HCF in real numbers?**

**ANS**: The HCF or greatest common divisor of two numbers is the largest number that divides both of them without leaving a remainder, which is significant in simplifying fractions and solving problems involving ratios.**Q8: Why is the number zero not considered a natural number?**

**ANS**: Zero is not considered a natural number because natural numbers start from 1 and represent the count of objects in a set.**Q9: How are rational numbers represented on the number line?**

**ANS**: Rational numbers can be represented on the number line by dividing it into equal segments and placing the numbers according to their value.**Q10: What practical applications do real numbers have?**

**ANS**: Real numbers are used in various applications such as measuring distances, calculating areas and volumes, managing finances, and in the fields of engineering and science.