Students can go through AP Board 8th Class Maths Notes Chapter 1 Rational Numbers to understand and remember the concepts easily.
AP State Board Syllabus 8th Class Maths Notes Chapter 1 Rational Numbers
→ The numbers which are expressed in the form of \(\frac{p}{q}\) where p and q are integers and q ≠ 0, are called “Rational Numbers” which are denoted by the letter ‘Q’.
→ Rational numbers are closed under the operations of addition, subtraction and multiplication.
→ Rational numbers are not closed on division.
→ Whole numbers:
→ Whole numbers:
→ The additive inverse of a is – a. (∵ a + (-a) = 0)
→ The multiplicative inverse of a is \(\frac{1}{a}\). (∵ a × \(\frac{1}{a}\) = 1)
→ The operations addition and multiplications are
- Commutative for rational numbers.
- Associative for rational numbers.
→ ‘0’ is the additive identity for rational number.
→ ‘1’ is the multiplicative identity for rational number.
→ A rational number and its additive inverse are opposite in their sign.
→ The multiplicative inverse of a rational number is its reciprocal.
→ Distributivity of rational numbers a, b and c is a(b + c) = ab + ac and a(b – c) = ab – ac.
→ Rational numbers can be represented on a number line.
→ There are infinite number of rational numbers between any two given rational numbers.
→ The concept of mean help us to find rational numbers between any two rational numbers.
→ The decimal representation of rational numbers is either in the form of terminating decimal or non-terminating recurring decimals.