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Irrational Numbers Video Lecture - Class 10

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FAQs on Irrational Numbers Video Lecture - Class 10

1. What are irrational numbers?
Ans. Irrational numbers are real numbers that cannot be expressed as a fraction of two integers. They are non-repeating and non-terminating decimal numbers, such as √2, √3, π, etc.
2. How do irrational numbers differ from rational numbers?
Ans. Irrational numbers and rational numbers differ in terms of their decimal representation. Rational numbers can be expressed as fractions or terminating decimals, while irrational numbers cannot be expressed in such a way and have non-repeating and non-terminating decimal expansions.
3. Can irrational numbers be negative?
Ans. Yes, irrational numbers can be both positive and negative. The sign of an irrational number depends on its position on the number line. For example, √2 is positive, while -√2 is negative.
4. How can we identify if a number is irrational?
Ans. One way to identify if a number is irrational is by checking if its decimal representation is non-repeating and non-terminating. Another way is to see if the number can be expressed as a fraction. If it cannot be expressed as a fraction, then it is irrational.
5. Can irrational numbers be approximated?
Ans. Yes, irrational numbers can be approximated using decimal approximations. For example, the value of √2 can be approximated as 1.414, but it is not exactly equal to this decimal. Irrational numbers can also be approximated using continued fractions or by using mathematical techniques.
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