Would you like to use MathemaGrids puzzles in your publication?
I can provide MathemaGrids puzzles in the sizes and difficulties listed below, in any print size, and at any resolution, and in most print formats (including TIFF, PNG, JPG, PDF, etc). Please feel free to contact me to discuss your requirements for MathemaGrids puzzles in more detail, and if required I'll send you some printable samples.
Puzzle A - 0 - 1 - 2 - 3 - random hints
Puzzle B - 0 - 1 - 2 - 3 - random hints
Puzzle C - 0 - 1 - 2 - 3 - random hints
Can you make the sums correct?
Complete the grid using all of the digits 1 to 9. When completed all of the sums must be correct. The sums are solved strictly left to right, top to bottom.
The normal order of mathematical operations is ignored. For example 2 + 5 x 9 is calculated as (2 + 5) x 9 = 63. There are no ÷ 1 in the puzzle. There are no x 1 in the puzzle (although there might be 1 x).
At no point will any calculation go below zero, or fractional. What are the numbers for?
These are the sums that have to be satisfied once all of the digits 1 to 9 are entered.
This is the start of the puzzle.
There is only one way to make 28 = 4 x 7 (or 7 x 4). As there is no ÷ 1 in any puzzle, there is no way of making 7 with the first two digits. Therefore the last digit must be the 7.
There is only one way to make 22 = 5 + 8 + 9 (as the 7 has already been used).
We are still after the 4 (Step 2: 4 x 7 = 28) in Column 1, and 8 ÷ 2 is now the only way of doing this.
The only remaining way to make 24 is 2 x 3 x 4. So the missing digits in Row 2 are 3 and 4. Which means the remaining digits (1 and 6) must be in Row 3.
As there are no ÷ 1 in any puzzle, Row 3 must be 7 - 1 ÷ 6 = 1.
There is no way of reaching 42 in Column 3 if we use the 5, therefore Column 3 must be 9 x 4 + 6 = 42.
This cannot be 9, as we've already used it. Similarly the centre square cannot be 4. The puzzle now completes.
The completed puzzle.