 # Changing The Subject - Odd One Out

## Which of the five versions of the formula is the odd one out because it is not equivalent to the other four?

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This is level 4; Formulas including brackets or expressions in the numerator or denominator of a fraction. You can earn a trophy if you answer the questions correctly.

 A$$a=5(b+c)$$ B$$\frac{a}{5}=b+c$$ C$$b=\frac{a}{5}-c$$ D$$c=\frac{a}{5}-b$$ E$$b=5(a+c)$$  A$$c=\frac{15-b}{3}$$ B$$b=3(c-5)$$ C$$c=\frac{b}{3}+5$$ D$$c=\frac{b+15}{3}$$ E$$b=3c-15$$  A$$c=7b+35$$ B$$b=5+\frac c7$$ C$$c=7(5+b)$$ D$$b=\frac{c-35}{7}$$ E$$b=\frac c7 - 5$$  A$$e=3+\frac d2$$ B$$\frac d2 = 3-e$$ C$$d=6-2e$$ D$$d=2(3-e)$$ E$$e=3-\frac d2$$  A$$x+y= \frac mn$$ B$$x=\frac mn - y$$ C$$m=nx+ny$$ D$$y = \frac mn + x$$ E$$m=n(x+y)$$  A$$w=u(v-r)$$ B$$v=\frac{w+ur}{u}$$ C$$r=\frac{uv+w}{u}$$ D$$w=uv-ur$$ E$$u=\frac{w}{v-r}$$  A$$t=\frac{p+2s}{s}$$ B$$p=s(t+2)$$ C$$s=\frac{p}{t+2}$$ D$$t=\frac{p-2s}{s}$$ E$$p=st+2s$$  A$$ab+ac=2$$ B$$a=\frac{2}{b+c}$$ C$$2 = a(b+c)$$ D$$b=\frac{2-ac}{a}$$ E$$c=\frac{2-ab}{b}$$  This is Changing The Subject - Odd One Out level 4. You can also try:
Level 1 Level 2 Level 3 Level 5 Level 6 Level 7 Level 8

## Instructions

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## Answers

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## Description of Levels

Close Level 1 - Formulas which can be rearranged by adding or subtracting terms from both sides

Example: Make e the subject of the formula d = e - f

Level 2 - Formulas which can be rearranged by multiplying or dividing both sides by a value

Example: Rearrange the formula n = mp

Level 3 - Formulas which can be rearranged by adding, subtracting, multiplying or dividing both sides by a value

Example: Rearrange the formula b = a + cd

Level 4 - Formulas including brackets or expressions in the numerator or denominator of a fraction

Example: Rearrange the formula p = s(t + 2)

Level 5 - Formulas including squares or square roots

Example: Rearrange the formula d² = 2a + 1

Level 6 - Finding the unknown which is not the subject of a formula

Example: If m = n² + 2p, find p when m=8 and n=10

Level 7 - Rearrange the formulae where the new subject appears twice; fill in the blanks

Example: Rearrange the formula ax + b = cx + g to make x the subject

Level 8 - Rearrange the formulae where the new subject appears twice; show your working

Example: Rearrange the formula a(3-x)=5x to make x the subject

Exam Style Questions - A collection of problems in the style of GCSE or IB/A-level exam paper questions (worked solutions are available for Transum subscribers).

More Algebra including lesson Starters, visual aids, investigations and self-marking exercises.

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## Curriculum Reference

See the National Curriculum page for links to related online activities and resources.

## Help Video

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