IGCSE Mathematics - General Math Revision

• Negative Numbers 
  • same signs = +ve
  • different signs = -ve
• Add and Subtract Fractions
  • Common denomenator
• Multiply and Divide Fractions in IGCSE Maths
  • Multiplying: x tops, x bottoms
  • Dividing: flip 2nd fraction then x
• Basic %
  • Fraction x100
• Fraction/ Decimal/ %
  • x or / by 100

• Prime Factorisation
  • factor tree
• In IGCSE Maths, you can find HCF and LCM by
  • factor tree, venn diagram
  • Venn diagram:
    • put no.s there are in common in centre
    • fill in rest of circles with other no.s
    • HCF: intersection no.s x together
    • LCM: all no.s in diagram x together
• Recurring Decimals
  • answers is always '/9' or '/99' or '999' etc
• Rounding
  • more than 5- round up
  • less than 5- round down
• Reverse %
  • divide amount given by 100- given %
  • TV reduced by 15% in sale now £100- original amount: 100/(100- 15)

End of this topic!

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