Introduction to Real Numbers

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Questions and Answers

What does Euclid's division algorithm state about two positive integers a and b?

  • The integer *a* can be divided by *b* and leaves a remainder *r* that is greater than or equal to *b*.
  • The integer *b* can be divided by *a* leaving a remainder *r*.
  • The integer *a* can be divided by *b* leaving a remainder *r* smaller than *b*. (correct)
  • The integer *a* can always be divided by *b* without any remainder.

What is a key application of the Fundamental Theorem of Arithmetic?

  • It is used to calculate the square roots of irrational numbers.
  • It simplifies the process of decimal conversion.
  • It provides methods for solving linear equations.
  • It demonstrates the uniqueness of the prime factorization of composite numbers. (correct)

How can the Fundamental Theorem of Arithmetic help understand the decimal expansion of a rational number p/q?

  • It explains the relationship between rational and irrational numbers.
  • The theorem allows the direct conversion of *p*/*q* into integers.
  • The prime factorization of *q* reveals the nature of the decimal expansion of *p*/*q*. (correct)
  • It provides the prime factorization of *p* only.

What notable irrational numbers were studied in Class IX related to the Fundamental Theorem of Arithmetic?

<p>√2, √3, and √5 (D)</p> Signup and view all the answers

What is the primary focus of the section discussing positive integers?

<p>The properties of positive integers related to divisibility and multiplication. (A)</p> Signup and view all the answers

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Study Notes

Introduction to Real Numbers

  • Continued exploration of real numbers and irrational numbers.
  • Focus on two key properties of positive integers: Euclid's Division Algorithm and the Fundamental Theorem of Arithmetic.

Euclid's Division Algorithm

  • States that any positive integer a can be divided by another positive integer b with a remainder r smaller than b.
  • Represents the standard long division process.
  • Important for understanding divisibility properties of integers.
  • Utilized mainly to compute the Highest Common Factor (HCF) of two positive integers.

Fundamental Theorem of Arithmetic

  • Asserts every composite number can be uniquely expressed as a product of prime numbers.
  • Simple to comprehend but has profound implications in mathematics.
  • Used to prove the irrationality of certain numbers such as √2, √3, and √5.
  • Helps determine the nature of the decimal expansion for rational numbers of the form p/q, with the prime factorization of q revealing key insights.

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