The British Independent and i newspapers run what they call an "Arithmetic Puzzle", which comprises a grid of nine cells, with each cell separated from the others by arithmetic symbols: (+ - / *), and a "result" row/column to the right and below. One or two cells have a single digit pre-inserted, and the task is to insert the other digits so that the equations are valid. Something like this (operations are performed left-to-right and top-to-bottom, not in standard mathematical order):
| 1 | x | 3 | x | 4 | = 12 | | + | | + | | - | | 8 | x | 5 | x | 6 | = 240 | | + | | + | | X | | 2 | + | 9 | + | 7 | = 18 | | = | | = | | = | | 11 | | 17 | |-14 |
Is there a specific name for this sort of puzzle?