Answer:

Mathematics NCERT GRADE 7, Chapter 9: Rational Numbers- As the name suggests, the chapter deals with rational numbers. A detailed explanation about rational numbers is GIVEN in the chapter. Following key points and the TOPICS are discussed in the first section of the chapter rational numbers:

Need for rational numbers

What are rational numbers?

A number that can be expressed in the form p/q, where p and q are INTEGERS and q ≠ 0, is called a rational number. All integers and fractions are rational numbers.

Examples: -2/7, 3/8, etc.

Numerator and denominator

In p/q, the integer p is the numerator, and the integer q (≠ 0) is the denominator.

Equivalent rational numbers: By multiplying the numerator and denominator of a rational number by the same non zero integer, we obtain another rational number equivalent to the given rational number.

Positive rational numbers: When the numerator and denominator both are positive

negative rational numbers: When the numerator is positive and denominator is negative.

The number 0 is neither a positive nor a negative rational number.

Subsequently, the concept of rational numbers on a number line is also explained

Step-by-step explanation:

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