Categories Brain Teasers and PuzzlesSwap Digits Tags Difficulty - Very Easy, Simple Math Swap two of the digits in this equation to make it a valid equation:7 x 7 + 9 x 9 = 138 Solution7 x 8 + 9 x 9 = 137 ← Card Pairing Game → Sword is Mightier than the Bow Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment *Name * Email * Δ