Rearranging Formulae
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  • Introduction
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Sometimes you are given a formula that will need to be manipulated to be useful to you.  You may have to rearrange the formula to make a different letter the subject.

Use the rules of equations (i.e. do the same to both sides) to achieve this.

 

Example

The formula for finding a temperature in degrees Centigrade from one in Fahrenheit is shown below.  Rearrange the formula to make F the subject.

 

Answer

Our aim is to get F on its own on the left hand side.

  • Question 1
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Rearrange the following formula to make w the subject.

 

v = lwh

l = vwh

w = vlh

w = v/lh

w = v/l/h

  • Question 2
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Rearrange the following formula to make u the subject.

 

v = u + at

u = v + at

u = v - at

u = v/at

u = vat

  • Question 3
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Rearrange the following formula to make a the subject.

 

v = u + at

a = v + ut

a = v - ut

a = (v - u)t

a = (v - u)/t

  • Question 4
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Rearrange the following formula to make c2 the subject.

 

a2 = b2 + c2

c² = a² + b²

c² = a² - b²

c² = b² - a²

c² = a² - b²

  • Question 5
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Rearrange the following formula to make c the subject.

 

a2 = b2 + c2

c² = a² + b²

c = √a² - b²

c = √(b² - a²)

c = √(a² - b²)

  • Question 6
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Rearrange the following formula to make h the subject.

 

A = ½bh

h = ½Ab

h = 2A/b

h = ½A/b

h = 2Ab

  • Question 7
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Rearrange the following formula to make h the subject.

 

P = 2(b + h)

h = ½Pb

h = 2P/b

h = ½P - b

h = 2P - b

  • Question 8
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Rearrange the following formula to make u the subject.

 

s = ut + ½at2

u = (s - ½at²)/t

u = v - at

u = st - 2at²

u = 2t² - ½at

  • Question 9
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Rearrange the following formula to make a the subject.

 

s = ut + ½at2

a = (s - ½at²)/t

a = sut²

a = st - 2ut²

a = 2(s - ut)/t²

  • Question 10
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Rearrange the following formula to make r the subject.

 

A = 4πr2

r = 4π/A

r = ½√π/A

r = √(A/4π)

r = √(4π/A)

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