Edexcel IGCSE Maths復習筆記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:
- Find the?lowest?common bottom (denominator)
- Write fractions with the?new?bottoms
- Multiply?tops by same as bottoms
- Write as a?single?fraction (take care if subtracting)
- Simplify?the top
- Turn Top Heavy Fractions back into Mixed Numbers (if necessary)
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