Edexcel IGCSE Maths复习笔记1.1.3 Multiplying & Dividing Fractions
Edexcel IGCSE Maths复习笔记1.1.3 Multiplying & Dividing Fractions
Dealing with mixed numbers
- Always turn Mixed Numbers into Top Heavy Fractions before doing calculations
Dividing fractions
- Never try to divide fractions
- Instead “flip’n’times”
- So “÷a/b” becomes “×b/a”
- And follow the rules for multiplying…
Multiplying fractions
- Simplify by factorising and cancelling (ignore the × between the fractions)
- Multiply the tops
- Multiply the bottoms
- Simplify by factorising and cancelling (if you missed something earlier)
- Turn Top Heavy Fractions back into Mixed Numbers (if necessary)
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