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IGCSE Mathematics - General Math Revision

Basic Skills & Number

· IGCSE Mathematics,Mathematics,IGCSE,Numbers,Basic Skills

Basic Skills

  • 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

Number

  • 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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Drafted by Gina (Mathematics)

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