Changing The Subject

Rearrange a formula in order to find a new subject in this self marking exercise.

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

This is level 6: finding the unknown which is not the subject of a formula You can earn a trophy if you get at least 9 correct and you do this activity online.

 If a = 2b + c, find c when a=6 and b=2 $$c=$$ If a = 2b + c, find b when a=24 and c=4 $$b=$$ If e = 3(f + g), find g when e=9 and f=2 $$g=$$ If e = 4(f + g), find f when e=14 and g=28 $$f=$$ If m = n² + 5p, find p when m=45 and n=10 $$p=$$ If m = n² + 3p, find n when m=73 and p=8 $$n=$$ If w = (u - 2v)², find v when w=49 and u=-15 $$v=$$ If 4j = (k - 8h)², find k when j=49 and h=-9 $$k=$$ If a = c - ¼b², find c when a=-13 and b=-26 $$c=$$ find p when: I=16 and b=5 $$p=$$ find x when: Z=39.7 and y=10 $$x=$$ find x when: A=1  $$x=$$
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This is Changing The Subject level 6. You can also try:
Level 1 Level 2 Level 3 Level 4 Level 5

Instructions

Try your best to answer the questions above. Type your answers into the boxes provided leaving no spaces. As you work through the exercise regularly click the "check" button. If you have any wrong answers, 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.

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© Transum Mathematics :: This activity can be found online at:
www.transum.org/software/SW/Starter_of_the_day/Students/Changing_The_Subject.asp?Level=6

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

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.

Example

This video provides help on 'changing the subject' and is from Corbettmaths.

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.

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.

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