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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

$$b=5(a+c)$$
Correct Wrong

A

$$c=\frac{15-b}{3}$$

B

$$b=3(c-5)$$

C

$$c=\frac{b}{3}+5$$

D

$$c=\frac{b+15}{3}$$

E

$$b=3c-15$$
Correct Wrong

A

$$c=7b+35$$

B

$$b=5+\frac c7$$

C

$$c=7(5+b)$$

D

$$b=\frac{c-35}{7}$$

E

$$b=\frac c7 - 5$$
Correct Wrong

A

$$e=3+\frac d2$$

B

$$\frac d2 = 3-e$$

C

$$d=6-2e$$

D

$$d=2(3-e)$$

E

$$e=3-\frac d2$$
Correct Wrong

A

$$x+y= \frac mn$$

B

$$x=\frac mn - y$$

C

$$m=nx+ny$$

D

$$y = \frac mn + x$$

E

$$m=n(x+y)$$
Correct Wrong

A

$$w=u(v-r)$$

B

$$v=\frac{w+ur}{u}$$

C

$$r=\frac{uv+w}{u}$$

D

$$w=uv-ur$$

E

$$u=\frac{w}{v-r}$$
Correct Wrong

A

$$t=\frac{p+2s}{s}$$

B

$$p=s(t+2)$$

C

$$s=\frac{p}{t+2}$$

D

$$t=\frac{p-2s}{s}$$

E

$$p=st+2s$$
Correct Wrong

A

$$ab+ac=2$$

B

$$a=\frac{2}{b+c}$$

C

$$2 = a(b+c)$$

D

$$b=\frac{2-ac}{a}$$

E

$$c=\frac{2-ab}{b}$$
Correct Wrong

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

Try your best to answer the questions above. Choose one of the five possible answers. When you have finished click the "check" button. If you have any questions wrong, do your best to do corrections but if there is anything you don't understand, please ask your teacher for help.

When you have got all of the questions correct you may want to print out this page and paste it into your exercise book. If you keep your work in an ePortfolio you could take a screen shot of your answers and paste that into your Maths file. You can also claim a 'Transum Trophy' by completing this quiz.

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Three Ways

Three Ways

Can you get to the target number by multiplying together four different one digit numbers? Can you do it in three different ways? There are nine levels to this online challenge and a virtual Transum Trophy available for each level.

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Description of Levels

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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

Example

Make \(y\) the subject of the following:

Example

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