Missing Operations

Each red box represents a missing operation (+, -, x or รท)
Can you find what they are?

(39 o 37) o 39 = 2964

37 o (20 o 21) = -37

(36 o 27) o 33 = 96

(21 o 31) o (26 o 26) = -62

 

 

 

 

 

 

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Keywords: Starter | Arithmetic

"Have used a number of your starters and found them to be very useful and enjoyable. We used the problem for 9 December today and one of the pupils pointed out what he felt was an error in the solution.

You gave 24 + (39 + 36) x 36 = 3564 it was pointed out that, using BIDMAS strictly, you should complete the brackets first, then multiply by 36 before adding the 24 at the start which will give 2724

Thank you"

Dave Loboda, St John's Middle School, Bromsgrove
Tuesday, December 11, 2007

 

"Thanks Dave. It is very good of you to take time to point out the error. The numbers and operations in this starter are generated randomly each time the page is refreshed. The combination of randomly generated operations you came across was handled incorrectly by the software. The problem has now hopefully been solved."

Transum,
Tuesday, December 11, 2007

 

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This starter has scored a mean of 3.8 out of 5 based on 17 votes.
 

  

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Answers

(39 + 37) x 39 = 2964

37 x (20 - 21) = -37

(36 + 27) + 33 = 96

(21 - 31) - (26 + 26) = -62

 

 
Note to teacher: Doing this activity once with a class helps students develop strategies. It is only when they do this activity a second time
that they will have the opportunity to practise those strategies. That is when the learning is consolidated. Click the button above to regenerate
another version of this starter from random numbers.