Class 8 Maths - ODISHA
Fractions in Disguise
In the Chapter 'Fractions in Disguise' from the Class 8 Mathematics curriculum for Odisha (BSE), students explore rational numbers and algebraic expressions that look like complex fractions but can be simplified. This chapter builds upon basic fraction operations by introducing variables, algebraic identities, and rational expressions. Mastering these concepts is crucial for board exam success as it lays the foundation for solving advanced algebraic equations, factorisation, and word problems efficiently. Students will learn how to uncover the true, simpler form of disguised fractions through factorization and cancellation.
Start Learning FreeKey Concepts
Rational Expressions
An algebraic fraction where both the numerator and the denominator are polynomials.
Simplification of Algebraic Fractions
Reducing a fraction to its lowest terms by cancelling common factors from the numerator and denominator.
Factorisation in Fractions
Splitting numerators and denominators into their product of factors to easily spot hidden common terms.
Domain Restrictions
Identifying values of the variable that make the denominator zero, which are excluded from the solution set.
Operations on Disguised Fractions
Performing addition, subtraction, multiplication, and division on complex algebraic fractions using LCM and reciprocal rules.
Important Formulas
Board Exam Info
In the Odisha (BSE) Class 8 Mathematics exams, this chapter typically carries around 6 to 8 marks. Questions usually include 1-mark objective questions, 2-mark short answer questions involving direct simplification, and 3-mark word or factorisation problems.
Frequently Asked Questions
Why are these fractions called 'in disguise'?
They look complicated or unfamiliar at first glance because they contain algebraic variables and polynomials, but they can be simplified into basic fractions using factorisation.
Can I cancel variables directly from the numerator and denominator?
No, you can only cancel common 'factors' (multiplied parts), not individual terms that are added or subtracted.
What happens if the denominator becomes zero after simplification?
Any value of the variable that makes the denominator zero is undefined, so those values must be explicitly excluded from the final answer.
Learn Fractions in Disguise with Your AI Tutor
10 different ways to study this chapter. Free for 3 chapters per day.
Lecture
Key Points
Interactive
Quiz
Flashcards