Mathematical content

• How to calculate percentages

  Part / whole x 100
• How to convert percentage to a decimal

  • Remove % sign.
  • Move the decimal point two places to the left.
• How to convert decimals to a fraction

  • Work out number of decimal places
  • Two decimal places = denominator is 100
  • Reduce the fraction by finding the highest common factor
• Ratios

  Always divided by the highest common factor.
• Significant figures

  A way to simplify very large or very small numbers by replacing some digits with a zero.
• Standard form

  A way of expressing very large or very small numbers.
• Estimates

  Give a number to just 1 or 2 significant figures.
• Order of magnitude

  Calculate standard form and compare exponents.
• =

  equal
• >

  greater than
• <

  less than
• >>

  much greater than
• <<

  much less than