# 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?

##### MenuLevel 1Level 2Level 3Level 4Level 5Level 6Level 7Level 8ExamHelpMore

This is level 2; Formulas which can be rearranged by multiplying or dividing both sides by a value. You can earn a trophy if you answer the questions correctly.

 A$$ab=c$$ B$$a=bc$$ C$$c=\frac ab$$ D$$bc=a$$ E$$b=\frac ac$$
 A$$m=\frac np$$ B$$mp=n$$ C$$p=\frac nm$$ D$$n=mp$$ E$$mn=p$$
 A$$e=3f$$ B$$f=\frac 13 e$$ C$$\frac ef = 3$$ D$$f = \frac e3$$ E$$f = \frac 3e$$
 A$$y = \frac 5x$$ B$$xy = 5$$ C$$x = \frac y5$$ D$$5 = xy$$ E$$x = \frac 5y$$
 A$$j = \frac h2$$ B$$2h = j$$ C$$h=2j$$ D$$\frac hj = 2$$ E$$j = \frac 12 h$$
 A$$s = \frac dt$$ B$$d = st$$ C$$t = \frac ds$$ D$$s = \frac td$$ E$$st=d$$
 A$$C = \pi d$$ B$$d = \frac{\pi}{C}$$ C$$d = \frac{C}{\pi}$$ D$$\pi = \frac Cd$$ E$$\pi d = C$$
 A$$A=wl$$ B$$w=\frac Al$$ C$$l=\frac wA$$ D$$l = \frac Aw$$ E$$wl=A$$

This is Changing The Subject - Odd One Out level 2. You can also try:
Level 1 Level 3 Level 4 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.

## Transum.org

This web site contains hundreds of free mathematical activities for teachers and students. Click here to go to the main page which links to all of the resources available.

## More Activities:

Comment recorded on the i asp?ID_Top 'Starter of the Day' page by Ros, Belize:

"A really awesome website! Teachers and students are learning in such a fun way! Keep it up..."

Comment recorded on the 28 May 'Starter of the Day' page by L Smith, Colwyn Bay:

"An absolutely brilliant resource. Only recently been discovered but is used daily with all my classes. It is particularly useful when things can be saved for further use. Thank you!"

Teacher! Are you delivering Maths lessons online?

Parents! Has home-schooling been thrust upon you at short notice?

Stay safe and wash yout hands!

#### Bidmaze

Find your way through the maze encountering mathematical operations in the correct order to achieve the given total. This is an addictive challenge that begins easy but develops into quite a difficult puzzle.

There are answers to this exercise but they are only available to teachers who have subscribed to Transum and are currently signed in on this computer.

A Transum subscription unlocks the answers to most of the student online exercises, quizzes and puzzles. It also provides the teacher with access to quality external links on each of the Transum topic pages so that teachers can easily find the excellent resources we have found and add to the collection themselves.

Class lists, lesson plans and assessment data can also be stored in the Class Admin application and the teacher also has access to the Transum Trophies earned by class members.

## Go Maths

Learning and understanding Mathematics, at every level, requires learner engagement. Mathematics is not a spectator sport. Sometimes traditional teaching fails to actively involve students. One way to address the problem is through the use of interactive activities and this web site provides many of those. Click here for more activities designed for students in upper Secondary/High school.

## Teachers

If you found this activity useful don't forget to record it in your scheme of work or learning management system. The short URL, ready to be copied and pasted, is as follows:

Alternatively, if you use Google Classroom, all you have to do is click on the green icon below.

Do you have any comments? It is always useful to receive feedback and helps make this free resource even more useful for those learning Mathematics anywhere in the world. Click here to enter your comments.

## 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.

Answers to this exercise are available lower down this page when you are logged in to your Transum account. If you don’t yet have a Transum subscription one can be very quickly set up if you are a teacher, tutor or parent.

## Curriculum Reference

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

## Example

Make $$y$$ the subject of the following:

Don't wait until you have finished the exercise before you click on the 'Check' button. Click it often as you work through the questions to see if you are answering them correctly. You can double-click the 'Check' button to make it float at the bottom of your screen.

Answers to this exercise are available lower down this page when you are logged in to your Transum account. If you don’t yet have a Transum subscription one can be very quickly set up if you are a teacher, tutor or parent.

Close