GCSE Maths (Edexcel)

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Using Formulae

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Algebra Notation, Vocabulary and Manipulation

Using Formulae

2:29 Formulae
Spec A3 A5
Previous Defining Formulae Next Changing the Subject
  • Values can be substituted into formulae in the same way as expressions
  • Substituting values into formulae allows us to calculate the result
  • Formulae are commonly used in real life situations
  • BIDMAS rules should still be followed when using formulae
  • Example: converting Celsius to Fahrenheit using the formula F = 9C/5 + 32
  • Step 1: Substitute the value for C (40 degrees C) into the formula
  • Step 2: Work out the value of the fraction (9 times 40 = 360, 360/5 = 72)
  • Step 3: Work out the addition to get the answer (72 + 32 = 104)
  • Therefore, 40 degrees Celsius corresponds to 104 degrees Fahrenheit

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