BIDMASA self marking exercise testing the application of BIDMAS, an acronym describing the order of operations used when evaluating expressions. 
This is level 5; Find the number that exploded in each of these calculations. You can earn a trophy if you get at least 9 correct and you do this activity online.
This is BIDMAS level 5. You can also try:
Level 1
Level 2
Level 3
Level 4
Two explosions in one question represent the same exploded number. However for a couple of the questions above there is more than one correct answer. As this is not an exercise in solving equations both solutions are not required. Either of the correct answers will be accepted.
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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Level 1  Click on the operations in the correct order.
Level 2  Evaluate the simple expressions using the correct order of operations.
Level 3  Drag the brackets onto the calculations to make them correct.
Level 4  Evaluate the harder expressions using the correct order of operations.
Level 5  Find the number that exploded in each of these calculations.
Missing Operations  Try this Starter of the Day and decide what mathematical operations are required.
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.
Barmy BIDMAS  An Advanced Lesson Starter about a misleading way of stating the answer to a simple calculation.
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.
BIDMAS is an acronym reminding pupils of the order of operation used when evaluating expressions involving a number of different 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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Kai,
Monday, March 20, 2017
"Knowing BIDMAS may help you win prizes in game shows!
"
Transum,
Thursday, June 13, 2019
"I have just noticed something I hadn’t realised about the Windows calculator. When running in standard mode it operates LTR (2+3x5=25) while in scientific mode it obeys the normal order of operations (2+3x5=17). Worth knowing when learning about BIDMAS or PEMDAS
"Dave Grochocki, Twitter
Sunday, June 16, 2019
Natalie M. Capps, @NatalieMCapps
Friday, November 4, 2022
"I haven’t heard of BIMDAS. We use GEMDAS to be Groupings then Exponents followed by Mult/Divide from left to right and finish with Add/Subtract from left to right. MDAS happens in order inside groupings.
I’m in the US, Virginia to be exact. It was PEMDAS when I was a kid and when I started teaching. Within the last 510 years, it’s switched in our area to GEMDAS as a way to prep vocabulary and thinking for more advanced math courses that go beyond simple parentheses."