That is correct!! 8 does end up fitting the sum horizontally and vertically. Great job @quochuy to be the first to provide the answer! However you did not follow the rules to claim the prize....you also need to upvote, follow and resteem. Since did complete 25% of the requirements, I am sending you 25% of the winnings. Congrats again and thanks for playing!
RE: Math Puzzle #7 - Be First to Answer Correctly and win SBD!