Changing The Subject  Odd One OutWhich of the five versions of the formula is the odd one out because it is not equivalent to the other four? 
This is level 5; Formulas including squares or square roots. You can earn a trophy if you answer the questions correctly.
InstructionsTry 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.orgThis 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. Please contact us if you have any suggestions or Questions. 

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Comment recorded on the 3 October 'Starter of the Day' page by Mrs Johnstone, 7Je: "I think this is a brilliant website as all the students enjoy doing the puzzles and it is a brilliant way to start a lesson." Comment recorded on the 1 February 'Starter of the Day' page by Terry Shaw, Beaulieu Convent School: "Really good site. Lots of good ideas for starters. Use it most of the time in KS3." 


AnswersThere 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. 

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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
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.
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