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Unitary Method

Test your understanding of the Unitary Method for solving real life proportion problems with this online, self-marking quiz.

Level 1 Level 2 Proportion Exam-Style Description Help Ratio

This is level 1: calculations that can be done without a calculator You can earn a trophy if you get at least 7 questions correct.

If four bicycle lamps cost £20 how much would seven lamps cost?

Bicycle Lamp

Working:

pounds Correct Wrong
If 180g of pumpkin can make enough soup for three people, what weight of pumpkin is needed to make soup for four people?

Pumpkin

Working:

g Correct Wrong
If seven tins of paint are enough for twenty one doors, how many doors would eight tins of paint cover?

Working:

doors Correct Wrong
A student can jog 3km in 15 minutes. At the same speed how long would it take him to jog 2km?

Working:

minutes Correct Wrong
A student can swim three lengths in 9 minutes. At the same speed how long would it take her to swim two lengths?

Working:

minutes Correct Wrong
A recipe for samosas requires 420g of flour for seven samosas. How much flour will be needed for three samosas?

Working:

g Correct Wrong
Two carpenters are buying wood to make some shelves. If 35m of wood is needed for seven shelves how much wood do they need for three shelves? Assume all of the shelves are the same length and width.

Working:

m Correct Wrong
The song "Out of Reach" is put on repeat play. If fourteen plays of the track last 49 minutes how many minutes would twelve plays take?

Working:

minutes Correct Wrong
Given the information in the previous question, how many times would the track have to be repeated to last three and a half hours?

Working:

times Correct Wrong
Each time this page is refreshed you will get slightly different questions although it should take about the same amount of time to answer all ten questions. If a student refreshed and answered all the questions on this page 5 times in 20 minutes. How many minutes would it take to complete 2 versions of this page assuming the student did not get any faster with practice?

Working:

minutes Correct Wrong
Check

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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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:

Saurav Luitel, Bhojpur

Monday, November 28, 2011

"I like the best web site of all I known that it was the very good as well as better for the student life thank for the team who make this web site."

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.

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Description of Levels

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Level 1 - Calculations that can be done without a calculator.

Level 2 - Calculations requiring written working and the use of a calculator.

Proportion Direct and inverse proportion questions.

Exam Style questions are in the style of GCSE or IB/A-level exam paper questions and worked solutions are available for Transum subscribers.

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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These problems can be solved using the unitary method. This is a technique in mathematics for solving particular types of problems. It involves scaling down one of the variables to a single unit, i.e. 1, and then performing the operation necessary to alter it to the desired value.

For example if six coins weigh 66g. What would seventeen coins weigh?

Coin Coin Coin
Coin Coin Coin

Consider the weight of one coin first

1 coin weighs 11g  (66 ÷ 6)

Now it is easy to calculate the cost of seventeen coins

17 coins weigh 187g (17 x 11)

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.

Log in Sign up

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