Logic grids of sums, differences, products and quotients: fill each row and column with 1 to 3, 4, 5 or 6, so that each marked region gives its target.
Each row and column holds every number once, and the numbers inside each heavy-bordered region must make the target shown in its corner using the operation shown. A single cell gives its own value. Every puzzle is checked to have exactly one solution.
Ask students to start with the single cells and two-cell regions with a clear answer, such as 12× or 2÷, since they narrow down the rest of the grid quickly.