Measuring AnglesUse the onscreen protractor to measure the size of the given angles as accurately as you can. 
This is level 2; Estimate the size of the obtuse angle using the correct protractor scale.
InstructionsTry 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. 



Transum.orgThis web site contains over a thousand free mathematical activities for teachers and pupils. Click here to go to the main page which links to all of the resources available. Please contact me if you have any suggestions or questions. 
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Mathematicians are not the people who find Maths easy; they are the people who enjoy how mystifying, puzzling and hard it is. Are you a mathematician? Comment recorded on the 17 November 'Starter of the Day' page by Amy Thay, Coventry: "Thank you so much for your wonderful site. I have so much material to use in class and inspire me to try something a little different more often. I am going to show my maths department your website and encourage them to use it too. How lovely that you have compiled such a great resource to help teachers and pupils. Comment recorded on the 10 April 'Starter of the Day' page by Mike Sendrove, Salt Grammar School, UK.: "A really useful set of resources  thanks. Is the collection available on CD? Are solutions available?" 
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AnswersThere are answers to this exercise but they are available in this space to teachers, tutors and parents who have logged in to their Transum subscription on this computer. A Transum subscription unlocks the answers to the online exercises, quizzes and puzzles. It also provides the teacher with access to quality external links on each of the Transum Topic pages and the facility to add to the collection themselves. Subscribers can manage class lists, lesson plans and assessment data in the Class Admin application and have access to reports of the Transum Trophies earned by class members. If you would like to enjoy adfree access to the thousands of Transum resources, receive our monthly newsletter, unlock the printable worksheets and see our Maths Lesson Finishers then sign up for a subscription now: Subscribe 

Go MathsLearning 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. The Go Maths page is an alphabetical list of free activities designed for students in Secondary/High school. Maths MapAre you looking for something specific? An exercise to supplement the topic you are studying at school at the moment perhaps. Navigate using our Maths Map to find exercises, puzzles and Maths lesson starters grouped by topic.  
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: 
Alternatively, if you use Google Classroom, all you have to do is click on the green icon below in order to add this activity to one of your classes. 
It may be worth remembering that if Transum.org should go offline for whatever reason, there is a mirror site at Transum.info that contains most of the resources that are available here on Transum.org. When planning to use technology in your lesson always have a plan B! 
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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Level 1  Estimate the size of the acute angle using the correct protractor scale
Level 2  Estimate the size of the obtuse angle using the correct protractor scale
Level 3  Read accurately the size of the angle given by three letters
Level 4  Position the protractor to measure the size of acute angles
Level 5  Position the protractor to measure the size of obtuse angles
Level 6  Position the protractor to measure the size of reflex angles
Level 7  Position the protractor to measure the size of angles less than 360^{o}
More on this topic including lesson Starters, visual aids and investigations.
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.
See the National Curriculum page for links to related online activities and resources.
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. You can doubleclick the 'Check' button to make it float at the bottom of your screen.
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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Craig, Twitter
Saturday, September 14, 2019
Mary Bluhm Holsten, Twitter
Friday, February 14, 2020
Lucy, Kenya
Tuesday, March 31, 2020
"I am impressed that there is such an exercise online. However, I have a quick question. How do I rotate the protractor on an iPad. On MacBook it works perfectly.
[Transum: Tick the checkbox in the red sentence above the questions. That works on an iPad.]"
Aaron Grossman, Twitter
Tuesday, February 23, 2021
Gabriel Dannemiller, Ohio
Friday, March 5, 2021
"This is a great resource. I used it last year during distance learning for my 4th students to practice measuring angles. It's very accurate, similar to using an actual protractor you hold in your hand, fairly easy to use and free. Thank you for providing this for free."
Emma Jane, Dalis,Tex
Thursday, April 28, 2022
"10/10 works really good."
Ben, Australia
Tuesday, October 25, 2022
"It’s a great program for angles."
Teacher, NZ
Tuesday, February 14, 2023
"Fun for kids. Works really well."