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Missing Terms

Find the missing terms of the sequences in this self marking quiz.

Level 1 Level 2 Level 3 Level 4 Level 5 Level Descriptions Help More Number Sequences

Here are some arithmetic sequences (positive numbers only). Can you figure out the missing terms?

1,  2,  3,  4,  
Correct Wrong

5,  __  ,  15,  ,  25
Correct Wrong

9,  __  ,  15,  __  ,  
Correct Wrong

6,  __  ,  __  ,  36,  
Correct Wrong

4,  __  ,  __  ,  49,  
Correct Wrong

5,  __  ,  __  ,  35,  
Correct Wrong

7,  __  ,  __  ,  ,  47
Correct Wrong

12,  __  ,  __  ,  102,  
Correct Wrong

32,  __  ,  __  ,  62,  
Correct Wrong

20,  __  ,  __  ,  44,  
Correct Wrong

18,  __  ,  __  ,  132,  
Correct Wrong

23,  __  ,  __  ,  74,  
Correct Wrong


This is Missing Terms level 1. You can also try:
Level 2 Level 3 Level 4 Level 5


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.

This 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 14 September 'Starter of the Day' page by Trish Bailey, Kingstone School:

"This is a great memory aid which could be used for formulae or key facts etc - in any subject area. The PICTURE is such an aid to remembering where each number or group of numbers is - my pupils love it!

Comment recorded on the 23 September 'Starter of the Day' page by Judy, Chatsmore CHS:

"This triangle starter is excellent. I have used it with all of my ks3 and ks4 classes and they are all totally focused when counting the triangles."

Featured Activity

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Move the pieces of the tower from one place to another in the minimum number of moves. This puzzle was invented in 1883 but is still as captivating today as it was all those years ago.


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Go Maths

Learning 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 Map

Are 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.


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:

"This is an excellent activity to make pupils think about the structure of a sequence rather than just learning a set of rules. It has worked very successfully for eleven year olds as well as sixteen year olds and is also an activity that can be done by pupils working in pairs. When pupils work with others the conversation about the methods they are using is very revealing."

Tuesday, October 28, 2014


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Description of Levels



Level 1 - Arithmetic sequences (positive numbers only)

Level 2 - Arithmetic sequences (including negative numbers)

Level 3 - Geometric sequences

Level 4 - Fibonacci-type sequences

Level 5 - Miscellaneous sequences


Levels 1 and 2 consist of arithmetic sequences where each term is a fixed amount more than the previous term.

If the first term is a and the fixed amount (common difference) is d then the nth term is:

a + (n−1)d

Level 3 consists of geometric sequences where each term is the the previous term multiplied by a fixed amount.

If the first term is a and the fixed amount (common ratio) is r then the nth term is:

a × rn−1

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.