# 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?

##### Level 1Level 2Level 3Level 4Level 5Level 6DescriptionHelpMore Algebra

This is level 3; Formulas which can be rearranged by adding, subtracting, multiplying or dividing both sides by a value. You can earn a trophy if you answer the questions correctly.

 A$$a=b+cd$$ B$$b=a+cd$$ C$$b=a-cd$$ D$$c = \frac{a-b}{d}$$ E$$d = \frac{a-b}{c}$$
 A$$m=n+3p$$ B$$n=m-3p$$ C$$p = \frac {m-n}{3}$$ D$$\frac{m-n}{p}=3$$ E$$n=m+3p$$
 A$$t=\frac{u-v}{a}$$ B$$v=u+at$$ C$$u=v-at$$ D$$a=\frac{v-u}{t}$$ E$$t= \frac{v-u}{a}$$
 A$$t= \frac{g-s}{2}$$ B$$g=t-2s$$ C$$g+2s=t$$ D$$s = \frac{t-g}{2}$$ E$$s = \frac{g-t}{2}$$
 A$$3x+2y=7$$ B$$3x=7-2y$$ C$$x = \frac{7-2y}{3}$$ D$$y = \frac{7-3x}{2}$$ E$$7+2y=3x$$
 A$$v=5u-\frac 13$$ B$$3v=5u-1$$ C$$5u-3v=1$$ D$$v=\frac{5u-1}{3}$$ E$$u = \frac{3v+1}{5}$$
 A$$2a+3b=c$$ B$$a=\frac{c-3b}{2}$$ C$$b = \frac{2a-c}{3}$$ D$$b = \frac{c-2a}{3}$$ E$$c = 2a+3b$$
 A$$n=\frac{360}{A}-1$$ B$$nA=359$$ C$$nA=360-A$$ D$$nA+A=360$$ E$$n+1=\frac{360}{A}$$

This is Changing The Subject - Odd One Out level 3. You can also try:
Level 1 Level 2 Level 4 Level 5 Level 6

## 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 19 October 'Starter of the Day' page by E Pollard, Huddersfield:

"I used this with my bottom set in year 9. To engage them I used their name and favorite football team (or pop group) instead of the school name. For homework, I asked each student to find a definition for the key words they had been given (once they had fun trying to guess the answer) and they presented their findings to the rest of the class the following day. They felt really special because the key words came from their own personal information."

Comment recorded on the 24 May 'Starter of the Day' page by Ruth Seward, Hagley Park Sports College:

"Find the starters wonderful; students enjoy them and often want to use the idea generated by the starter in other parts of the lesson. Keep up the good work"

#### Snooker Angles

This must be the most enjoyable way to practise estimating angles and learn about bearings. Snooker Angles is an interactive game for one or two players.

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.

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

## Help

In level 6, there are two solutions to the questions which involve finding a square root (which could be positive or negative). This program will accept either of the possible answers.

Close