GCSE Maths (AQA)

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Converting from Standard Form

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Number Structure and Calculation

Converting from Standard Form

4:14 Standard Form
Spec N9
Previous Standard Form Next Converting to Standard Form
  • To convert from standard form to an ordinary number, use the index to determine how to move the digits.
  • A number is in standard form if it is written as a number between 1 and 10 multiplied by 10 raised to some index.
  • Positive index means digits are moved to the left when converting back to an ordinary number.
  • Fill in gaps with zeros when moving digits.
  • Negative index means digits are moved to the right when converting back to an ordinary number.
  • Practice examples:
  • 4.9 times 10 to the 7 can be written as 49,000,000.
  • 7.39 times 10 to the -4 can be written as 0.000739.
  • Converting from standard form is often part of more complex questions.

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