What are you waiting for? Quickly answer the questions below. This is level 2: Subtraction of numbers less than 20. You can earn a trophy if you get at least 25 answers correct and you do this activity online at www.transum.org/go/?to=beat .
Is the clock too fast for you?
Did you make some mistakes?
Would you like to try again?
© Transum Mathematics WWW.TRANSUM.ORG
This is Beat The Clock level 2. You can also try:
Level 1
Level 3
Level 4
Level 5
Level 6
Level 7
Level 8
Level 9
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. 
More Activities: 

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 14 October 'Starter of the Day' page by Inger Kisby, Herts and Essex High School: "Just a quick note to say that we use a lot of your starters. It is lovely to have so many different ideas to start a lesson with. Thank you very much and keep up the good work." Comment recorded on the 28 May 'Starter of the Day' page by L Smith, Colwyn Bay: "An absolutely brilliant resource. Only recently been discovered but is used daily with all my classes. It is particularly useful when things can be saved for further use. Thank you!" 
Each month a newsletter is published containing details of the new additions to the Transum website and a new puzzle of the month. The newsletter is then duplicated as a podcast which is available on the major delivery networks. You can listen to the podcast while you are commuting, exercising or relaxing. Transum breaking news is available on Twitter @Transum and if that's not enough there is also a Transum Facebook page. 

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 are mirror sites at Transum.com and Transum.info that contain 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. 
Close
Level 1  Addition of single digit numbers
Level 2  Subtraction of numbers less than 20
Level 3  Addition and subtraction of numbers less than 30
Level 4  Multiplication facts up to twelve times twelve
Level 5  Division facts in tables up to twelve.
Level 6  Mixed Multiplication and Division
Level 7  All four operations, two terms
Level 8  All four operations, two terms, harder
Level 9  All four operations, three terms
More on Mental Methods including lesson Starters, visual aids and selfmarking exercises.
Transum,
Tuesday, February 17, 2015
"If you are not up to answering the questions quickly enough you could start by just doing the left column. If you can manage that progress to the left two columns until you build up enough speed to try all of the columns. Each time you start the clock the questions change so you do not need to worry about repeating yourself! Enjoy."
Andy Parkin, via Twitter
Friday, February 20, 2015
"How can I embed the code for Beat The Clock into my Wordpress blog?
Would like to make your games a feature, but better than a link."
Transum,
Saturday, February 21, 2015
"Thanks for your question Andy. It can be done by using an inline frame. Here is the code you will need:
<iframe id="I1" name="I1" src="https://www.transum.org/Maths/Activity/Beat_The_Clock/" style="width: 963px; height: 970px">
It needs copying and pasting as text (not visual)."
Clint Lees,
Friday, May 14, 2021