Puzzle Detail
Addition Mathdoku Addition 9×9 Hard — Set 20
| 3= | 8+ | 9= | 9+8 | 20+ | 7= | |||
| 5= | 1= | 6= | 18+ | 10+ | ||||
| 9= | 8= | 7 | 10+ | 27+ | ||||
| 15+ | 4+ | 4= | ||||||
| 1= | 13+ | 9= | 8= | 12+ | 18+ | 9+ | ||
| 14+ | 18+ | |||||||
| 11+ | 7= | 21+ | 8+ | 17+ | ||||
| 7 | 3= | 9= | 9+ | |||||
| 15+9 | 8= | 9+ | 9+ | 1= | 3= |
Show solution
| 3 | 6 | 9 | 1 | 8 | 4 | 5 | 2 | 7 |
| 5 | 2 | 1 | 6 | 4 | 9 | 7 | 3 | 8 |
| 9 | 8 | 5 | 7 | 2 | 3 | 1 | 4 | 6 |
| 8 | 5 | 2 | 3 | 1 | 6 | 4 | 7 | 9 |
| 2 | 1 | 4 | 9 | 7 | 8 | 3 | 6 | 5 |
| 7 | 3 | 6 | 2 | 9 | 1 | 8 | 5 | 4 |
| 1 | 4 | 7 | 8 | 3 | 5 | 6 | 9 | 2 |
| 4 | 7 | 3 | 5 | 6 | 2 | 9 | 8 | 1 |
| 6 | 9 | 8 | 4 | 5 | 7 | 2 | 1 | 3 |
Solver Notes
Our addition mathdoku puzzles focus exclusively on addition cages, making them ideal for practicing arithmetic while enjoying a logic challenge.
What are addition mathdoku puzzles?
Addition mathdoku puzzles restrict every cage to a single addition calculation. This makes them excellent for drilling that one operation.
Who are these puzzles for?
They suit anyone from elementary students learning addition to adults who enjoy arithmetic logic puzzles.
Are solutions included?
Yes — every addition mathdoku on Freemathdoku.com comes with a full solution so you can check your work.