# Edexcel IGCSE Maths 复习笔记 2.6.1 Algebraic Fractions - Adding & Subtracting

Edexcel IGCSE Maths 复习笔记 2.6.1 Algebraic Fractions - Adding & Subtracting

#### What is an algebraic fraction?

• An algebraic fraction is simply a fraction with an algebraic expression on the top (numerator) and/or the bottom (denominator)

• Rules same as numeric fractions:
1. Find the lowest common bottom (denominator)
2. Write fractions with new bottoms
3. Multiply tops by the same as bottoms
4. Write as a single fraction (take care if subtracting)
5. Simplify the top
• Always leave your answer in as simple a form as possible (see Algebraic Fractions – Simplifying)

#### Exam Tip

Leaving the top and bottom of the fraction in factorised form will help you see if anything cancels.