3
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Transcription (cells with ■ do not exist in the image version of the grid and should not be filled)

+ - = 1
- + +
x - = 29
- x -
x - = -1
= = =
-10 9 1

Here are the rules: use 1-9 only once in the black cells. Order of operations matters.

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1
  • $\begingroup$ Have you tried? $\endgroup$ Jan 28, 2016 at 16:29

2 Answers 2

5
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3 2 4
5 7 6
8 1 9

I started off with the middle row, the left two numbers have to be above 30, so 8x4, 9x4, 7x5
Bottom middle usually was 1, so the top middle adds up with middle to 9
Left column was interesting. You had to have two numbers that weren't used yet that could get you to -10

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4
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3 | 2 | 4

5 | 7 | 6

8 | 1 | 9

Trial and error, mostly.

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