Upper and Lower Bounds

Determine the upper and lower bounds when rounding or truncating quantities used in calculations.

Level 1Level 2Level 3Level 4Level 5Exam-StyleDescriptionHelpMore Rounding

This is level 5: calculations involving upper and lower bounds. You can earn a trophy if you get at least 7 questions correct.

 1. The sides of a square are measured to be 4cm to the nearest centimetre. What is the largest possible area the square could have? cm2 2. A rectangle is 2cm wide and 5cm long. Both lengths have been rounded to the nearest centimetre. What is the smallest possible area the rectangle could have? cm2 3. A triangle has a base of 4.5cm and a height of 7.4cm. Both lengths have been rounded to one decimal place. What is the largest possible area of the triangle? Give your answer to three significant figures. cm2 4. The radius of a circle is measured to be 8.56cm to three significant figures. What is the largest possible circumference the circle could have? Give your answer to three significant figures. cm 5. For the circle mentioned in the previous question. What is the smallest possible area the circle could have? Give your answer to three significant figures. cm2 6. The area of a square is 3.63cm2 to three significant figures. What is the largest possible perimeter the square could have? Give your answer to three significant figures. cm 7. An isosceles right-angled triangle has two sides of length 3.93cm to three significant figures. What is the largest possible length of the third side? Give your answer to three significant figures. cm 8. If a = 57, b = 25 and c = 38 (all given to the nearest integer) find the largest possible value for a + b − c. 9. If d = 43, e = 70 and f = 62 (all given to the nearest integer) find the largest possible value for (d − e) ÷ f. Give your answer to three significant figures. 10. A car travels for 335 miles in 7 hours 30 minutes. The distance was rounded to the nearest five miles and the time was rounded to the nearest 15 minutes. What is the upper bound for the average speed of the car? Give your answer in miles per hour to three significant figures. mph
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This is Upper and Lower Bounds level 5. You can also try:
Level 1 Level 2 Level 3 Level 4

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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Description of Levels

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Level 1 - Numbers truncated to a given multiple.

Level 2 - Quantities rounded to a given multiple.

Level 3 - Numbers rounded to a number of decimal places.

Level 4 - Quantities rounded to a number of significant figures.

Level 5 - Calculations involving upper and lower bounds.

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.

Examples

This video is from the excellent 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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