Writing formulae (Edexcel GCSE Maths): Flashcards
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Practise the cards
12 cards from this deck
Definition of a formula
Definition of a formula
Mathematical rule showing relationship between quantities
Two ways to write formulae
Two ways to write formulae
Word formula and algebraic formula
First step converting word rule to algebraic formula
First step converting word rule to algebraic formula
Identify the quantities involved
Why always define what each letter represents?
Why always define what each letter represents?
Gets marks even if formula is wrong
Why keep units consistent in formulae?
Why keep units consistent in formulae?
Ensure all quantities use same units
Algebraic formula: cooking time = 25 × weight (kg) + 30
Algebraic formula: cooking time = 25 × weight (kg) + 30
(=time mins, =weight kg)
Perimeter formula: regular hexagon, side length
Perimeter formula: regular hexagon, side length
(=perimeter, =side length)
Car hire: £80 + 50p/mile in pounds
Car hire: £80 + 50p/mile in pounds
(=cost £, =miles)
Advantage of algebraic over word formulae
Advantage of algebraic over word formulae
More efficient for calculations
Examples of sensible letter choices
Examples of sensible letter choices
for time, for cost
Common formula exam question: shapes
Common formula exam question: shapes
Area or perimeter of shapes
Key exam tip about variables
Key exam tip about variables
Always state what each letter represents