Rational Numbers class 8 Notes Mathematics

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Rational Numbers class 8 Notes Mathematics

Download CBSE class 8th revision notes for Chapter 1 Rational Numbers class 8 Notes Mathematics in PDF format for free. Download revision notes for  Rational Numbers class 8 Notes Mathematics and score high in exams. These are the Rational Numbers class 8 Notes Mathematics prepared by team of expert teachers. The revision notes help you revise the whole chapter in minutes. Revising notes in exam days is on of the best tips recommended by teachers during exam days.

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CBSE Class 8 Revision Notes Maths Rational Numbers

• Rational numbers are closed under the operations of addition, subtraction and multiplication.
• The operations addition and multiplication are
  (i) commutative for rational numbers.
  (ii) associative for rational numbers.
• The rational number 0 is the additive identity for rational numbers.
• The rational number 1 is the multiplicative identity for rational numbers.
• The additive inverse of the rational number  is  and vice-versa.
• The reciprocal or multiplicative inverse of the rational number  is  if x=1
• Distributivity   of rational numbers: For all rational numbers a, b and c,
  a(b + c) = ab + ac    and  a(b – c) = ab – ac
• Rational numbers can be represented on a number line.
• Between any two given rational numbers there are countless rational numbers. The idea of mean helps us to find rational numbers between two rational numbers.
• Positive Rationals: Numerator and Denominator both are either positive or negative. Example:
• Negative Rationals: Numerator and Denominator both are of opposite signs. Example:
• Additive Inverse: Additive inverse (negative) +=+=0,  is the additive inverse of  is the additive inverse of .
• Multiplicative Inverse (reciprocal): x=1=x where  is the reciprocal of . Zero has no reciprocal. The reciprocal of 1 is1 and of -1 is -1.

CBSE Class 8 Revision Notes and Key Points

Rational Numbers class 8 Notes Mathematics. CBSE quick revision note for class-8 Mathematics, Physics, Chemistry, Biology and other subject are very helpful to revise the whole syllabus during exam days. The revision notes covers all important formulas and concepts given in the chapter. Even if you wish to have an overview of a chapter, quick revision notes are here to do it for you. These notes will certainly save your time during stressful exam days.

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