The origin of this puzzle is not known.
Puzzle and Goal
An unsolved puzzle consists of a square grid with mathematical operators between them. There are number clues at the right and bottom.
The goal is to place numbers in the grid such that the equations are true.
The solved grid must satisfy the following conditions:
No number is repeated in the grid. For example, for a 3x3 grid, use the numbers 1 to 9 once each.