Edexcel IGCSE Maths复习笔记1.1.2 Adding & Subtracting Fractions

Dealing with mixed numbers

• Always turn Mixed Numbers into Top Heavy Fractions before doing calculations

Adding & Subtracting

• Adding and subtracting are treated in exactly the same way:

1. Find the lowest common bottom (denominator)
2. Write fractions with the new bottoms
3. Multiply tops by same as bottoms
4. Write as a single fraction (take care if subtracting)
5. Simplify the top
6. Turn Top Heavy Fractions back into Mixed Numbers (if necessary)

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