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Maths problem to solve while sitting around the campfire?

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See if you can work this out given to me by a fifth grader please show working out

12 + -9 - -3 =
 
Ill give it to you Bigwave, there are two trains of thought amongst the math community re the last sum and your answer is one of them, the other is undefined.
Over to you.
 
I agree It appears to be a number pattern.
3x6, 4x8, 5x10, 6x12 , 7x14, 8x16, 9x18, 10x 20 which would equal 200
 


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