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Introduction to Rational Numbers - Math, Class 7 Video Lecture

FAQs on Introduction to Rational Numbers - Math, Class 7 Video Lecture

1. What are rational numbers?

Ans. Rational numbers are numbers that can be expressed as a fraction, where the numerator and denominator are both integers. These numbers can be positive, negative, or zero, and they can be terminating (ending in a finite number of digits) or non-terminating repeating (having a recurring pattern of digits).

2. How can we identify if a number is rational or not?

Ans. To identify if a number is rational or not, we need to check if it can be expressed as a fraction. If a number can be written in the form of p/q, where p and q are integers and q is not equal to zero, then the number is rational. If a number cannot be expressed in this form, then it is not rational.

3. Are all whole numbers rational?

Ans. Yes, all whole numbers are rational. Whole numbers can be expressed as fractions where the denominator is 1. For example, the whole number 5 can be written as 5/1, which is a fraction. Since whole numbers can be expressed as fractions, they are considered rational numbers.

4. Can irrational numbers be converted into rational numbers?

Ans. No, irrational numbers cannot be converted into rational numbers. Irrational numbers are numbers that cannot be expressed as a fraction. They have non-repeating and non-terminating decimal representations. Examples of irrational numbers include √2, π (pi), and e. It is not possible to find a fraction that is equal to an irrational number.

5. How are rational numbers used in real life?

Ans. Rational numbers have various real-life applications. They are used in measurements, such as telling time, calculating distances, and measuring ingredients in cooking. In finance, rational numbers are used for calculations involving money, interest rates, and investments. Rational numbers are also used in sports statistics, probability calculations, and even in computer programming algorithms.

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Oct 06, 2025 Last updated

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