BIDMASA self marking exercise testing the application of BIDMAS, an acronym describing the order of operations used when evaluating expressions. 
This is level 1; Click on the operations in the correct order..
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. 



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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 1 May 'Starter of the Day' page by Phil Anthony, Head of Maths, Stourport High School: "What a brilliant website. We have just started to use the 'starteroftheday' in our yr9 lessons to try them out before we change from a high school to a secondary school in September. This is one of the best resources online we have found. The kids and staff love it. Well done an thank you very much for making my maths lessons more interesting and fun." Comment recorded on the 28 September 'Starter of the Day' page by Malcolm P, Dorset: "A set of real life savers!! 


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© Transum Mathematics :: This activity can be found online at:
www.transum.org/software/SW/Starter_of_the_day/Students/BIDMAS_Click.asp?Level=1
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Level 1  Click on the operations in the correct order.
Level 2  Evaluate the simple expressions using the correct order of operations.
Level 3  Evaluate the harder expressions using the correct order of operations.
Misconception  A video explaining a BIDMAS problem which went viral on Twitter.
X Divided by 2Y  A Maths Lesson Starter based on the BIDMAS misconception.
BIDMAS Game  A game for two or more players making BIDMAS calculations to claim squares on a grid.
Don't wait until you have finished the exercises 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.
For this exercise you don't have to make any calculations!
All you have to do is click on the operations in the correct order. If you get it right the next stage of the calculation will appear.
1. If there are brackets in the expression, click on the calculation inside the brackets first.
2. If a power or index is present in the calculation, click on that next.
3. Click on multiplication and division signs, working from left to right through the expression.
4. Finally click on addition and subtraction signs, working from left to right through the expression.
People have found an acronym a useful way to remember the order of operations.
The letters of BIDMAS stand for:
When only addition and subtraction (or only multiplication and division) are left in an expression you should work them out in the order you find them, starting from the left and working towards the right. The blue image of the letters above has been designed to show that multiplication and division have the same importance as the letter M is in the same position as the letter D. The same can be said for the letters A and S.
For example, to evaluate the expression 3^{2} + 5 x 7  (4  3)
Work out the brackets first which gives 3^{2} + 5 x 7  1
Then the indices 9 + 5 x 7  1
Then the multiplication 9 + 35  1
Then the addition and subtraction in the order they are given
The answer is 43
PEMDAS is an alternative acronym.
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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