The Contest Center - Cross Sums

Cross Sums are crossword puzzles using numbers

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CROSS SUMS
The Contest Center
59 DeGarmo Hills Road
Wappingers Falls, NY 12590

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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

Stumped? Give up? Click here for the answers.

The Contest Center welcomes contributions of your original puzzles, riddles and jokes, including anagrams, cryptograms, plus math-themed art and animations. Share your creations with other puzzle-lovers.

All submissions must be your own original work. Do not submit material that is copyrighted elsewhere. Do not submit material that you found in books, magazines, TV shows, movies, podcasts, or on other websites.

Send submissions to Contest Center Submissions
Submit puzzle answers to Contest Center Answers
Send questions and correspondence to Contest Center Mail

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