Fun Video: What are Irrational Numbers?

# Fun Video: What are Irrational Numbers? Video Lecture - Crash Course: Class 9

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## FAQs on Fun Video: What are Irrational Numbers? Video Lecture - Crash Course: Class 9

 1. What are irrational numbers?
Ans. Irrational numbers are real numbers that cannot be expressed as a ratio of two integers. They are non-repeating and non-terminating decimals. Examples of irrational numbers include pi(π), the square root of 2, and the golden ratio.
 2. How are irrational numbers different from rational numbers?
Ans. Rational numbers are real numbers that can be expressed as a ratio of two integers. Irrational numbers, on the other hand, cannot be expressed as a ratio of two integers.
 3. What is the importance of irrational numbers?
Ans. Irrational numbers are important in mathematics because they are used to describe the measurement of circles, triangles, and other shapes. They are also used in calculus to solve problems related to limits, derivatives, and integrals.
 4. Can irrational numbers be negative?
Ans. Yes, irrational numbers can be negative. For example, the square root of 2 is an irrational number that is also negative (-√2).
 5. How can irrational numbers be identified?
Ans. Irrational numbers can be identified by their decimal representation. If the decimal representation of a number is non-repeating and non-terminating, then it is an irrational number. Another way to identify irrational numbers is by trying to express them as a ratio of two integers. If it cannot be expressed as a ratio of two integers, then it is an irrational number.

## Crash Course: Class 9

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