Cross Sums are crossword puzzles using numbers
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CROSS SUMS
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       Here is a selection of Cross Sum puzzles, carefully ranked from easiest to hardest.
       Your job is to fill the numbers from 1 to 9 into the 9 empty boxes so that the arithmetic in each row is correct. The math operations are performed from left to right. So to evaluate 1+2×5 you first add 1+2 to get 3, and then multiply that by 5 to get 15.
       When performing the operations you may never go below zero, and each division must be even. Thus you could not have 5-7+4 because 5-7 goes below 0, and you could not have 7÷2+6 because 7÷2 is not an even division, it has a remainder.
       If you have never worked a Cross Sum puzzle before, CLICK HERE for a fully worked-out example and explanation.


Cross Sum #1
Difficulty level 1
    +     ×     42
×   +   ÷  
  ×   ÷   28
-   ×   +  
  -   +   13
23   10   8  


Cross Sum #2
Difficulty level 2
    +     -     5
-   +   ×  
  ×   +   12
+   ×   +  
  +   -   1
5   63   53  


Cross Sum #3
Difficulty level 3
    ×     +     29
+   +   ×  
  ×   ×   108
×   -   +  
  -   ×   9
72   5   12  


Cross Sum #4
Difficulty level 4
    ×     ÷     3
+   +   +  
  ×   -   20
-   -   -  
  -   -   2
7   4   6  


Cross Sum #5
Difficulty level 5
    +     -     9
+   -   -  
  ×   ×   12
+   +   +  
  +   +   21
10   11   8  


Cross Sum #6
Difficulty level 6
    -     +     10
+   -   -  
  -   ×   12
+   -   ×  
  +   -   3
15   0   4  


Cross Sum #7
Difficulty level 7
    +     -     5
×   +   -  
  -   ÷   1
+   ×   ×  
  +   +   14
22   40   9  


Cross Sum #8
Difficulty level 8
    +     +     16
-   ×   +  
  +   +   18
+   +   ×  
  -   +   9
4   19   72  


Cross Sum #9
Difficulty level 9
    -     ×     6
+   +   +  
  +   ×   30
+   ÷   +  
  -   ×   6
19   1   12  


Cross Sum #10
Difficulty level 22
    +     +     17
-   +   -  
  -   ÷   1
+   +   +  
  +   +   18
5   12   10  







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