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Eleven In Your Head

Use some mental arithmetic tricks to multiply numbers by eleven in your head.

Tips and Tricks Divide by Eleven More Mental Methods

You can earn a trophy if you get at least 9 questions correct and you do this activity online.

11 x 2

Correct Wrong

11 x 6

Correct Wrong

11 x 13

Correct Wrong

11 x 23

Correct Wrong

11 x 27

Correct Wrong

11 x 30

Correct Wrong

11 x 47

Correct Wrong

11 x 238

Correct Wrong

11 x 691

Correct Wrong

11 x 1157

Correct Wrong

11 x 3099

Correct Wrong

11 x 4263

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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Why am I learning this?

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 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!"

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!
Thanks"

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Answers

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Teachers

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© Transum Mathematics :: This activity can be found online at:
www.Transum.org/go/?Num=248

"The eleven times table has always been very easy to learn up to 9 x 11. Here's a way of multiplying large numbers by 11 too:
Example:
Q. What is 324 x 11 ?
A. Write down the first digit ... 3
.......Add the first and second digits ... 3 + 2 = 5
.......Add the second and third digits .. 2 + 4 = 6
.......Write down the last digit ........... 4
The answer is 3564.
Try it yourself ... multiply 543 by 11
Do you know why it works?
Does it work for all three digit numbers?"

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.

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Curriculum Reference

See the National Curriculum page for links to related online activities and resources.