GCSE Maths (Edexcel)

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Standard Form

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Number Structure and Calculation

Standard Form

4:19 Standard Form
Spec N9
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  • Standard form is a way of writing very large and very small numbers
  • Standard form is written as A times 10 to the power of n, where A is between 1 and 10
  • Standard form is also known as standard index form or scientific notation
  • To recognize if a number is in standard form, the number being multiplied by the power of 10 must be between 1 and 10 (excluding 10)
  • Powers of 10 in standard form are written in a condensed form and indicate how many zeros there are after the one in the original number
  • Standard form is useful for writing very large numbers quickly and easily
  • Standard form can also be used for very small numbers by using negative powers of 10
  • Negative powers of 10 are equal to 1 divided by the positive power
  • Any number to the power of 0 equals 1
  • Writing very small numbers in standard form is easier than writing them as decimals
  • Practice and experience will help in understanding the scales represented by different powers of ten in standard form.

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