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Puzzles

4 December

Put the digits 1 to 9 (using each digit exactly once) in the boxes so that the sums are correct. The sums should be read left to right and top to bottom ignoring the usual order of operations. For example, 4+3×2 is 14, not 10. Today's number is the product of the digits in the red boxes.
+÷= 2
+ ÷ -
÷-= 5
÷ - ×
-×= 4
=
3
=
5
=
6
Tags: grids, numbers

20 December

Put the digits 1 to 9 (using each digit exactly once) in the boxes so that the sums reading across and down are correct. The sums should be read left to right and top to bottom ignoring the usual order of operations. For example, 4+3×2 is 14, not 10.
+-= 8
- - -
+÷= 9
+ ÷ ×
+×= 108
=
6
=
1
=
18
The answer is the product of the digits in the red boxes.

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Tags: numbers, grids

18 December

Put the digits 1 to 9 (using each digit once) in the boxes so that the three digit numbers formed (reading left to right and top to bottom) have the desired properties written by their rows and columns.
multiple of 9
multiple of 3
multiple of 5
multiple of 6multiple of 4cube number
Today's number is the multiple of 6 formed in the left hand column.

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Tags: numbers, grids

13 December

Put the digits 1 to 9 (using each digit once) in the boxes so that the three digit numbers formed (reading left to right and top to bottom) have the desired properties written by their rows and columns.
The row marked sum is equal to the sum of the other two rows. The column marked sum is equal to the sum of the other two columns.
odd
all digits even
sum
evenoddsum
Today's number is the largest three digit number in this grid.

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Tags: numbers, grids

12 December

Put the digits 1 to 9 (using each digit exactly once) in the boxes so that the sums reading across and down are correct. The sums should be read left to right and top to bottom ignoring the usual order of operations. For example, 4+3×2 is 14, not 10.
+-= -2
- - -
+÷= 4
+ ÷ ×
+×= 50
=
4
=
-4
=
10
The answer is the product of the digits in the red boxes.

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Tags: numbers, grids

6 December

Put the digits 1 to 9 (using each digit once) in the boxes so that the three digit numbers formed (reading left to right and top to bottom) have the desired properties written by their rows and columns.
multiple of 5
multiple of 7
cube number
multiple of 9multiple of 3multiple of 4
Today's number is the multiple of 5 formed in the first row.

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Tags: numbers, grids

4 December

Put the digits 1 to 9 (using each digit exactly once) in the boxes so that the sums reading across and down are correct. The sums should be read left to right and top to bottom ignoring the usual order of operations. For example, 4+3×2 is 14, not 10.
-+= -4
+ + +
-÷= -1
- ÷ ×
-×= -30
=
0
=
2
=
54
The answer is the product of the digits in the red boxes.

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Tags: numbers, grids

The self referential crossword

Fill in the following crossnumber grid so that each clue describes the solution.
For example, if some clues read "TEN DS", "ONE X" and "THREE ES" then there will be ten Ds, one X and three Es in the completed grid. The entries in the crossword include the spaces.

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