Be Patient:

I know this might be a hard problem.
Let me give you a glue so that you may go back to the question and try again!

Firstly, since it is a 4-digit number plus a 4-digit number and becomes a 5-digit number, the largest number can only be 1x,xxx. Thus, "M" = 1.
Secondly, if "M" = 1, the problem becomes SEND + 1ORE = 1ONEY. Since every letter represents a unique digit, the most SEND + 1ORE = 1ONEY can only be 9,864 + 1,753 = 11,617. However, the digit "1" is already taken by "M" and, in this case, "O" cannot be bigger than 1 or equal 1. Therefore, "O" must be represented "0" and the problem now becomes SEND + 10RE = 10NEY.

I have solved two letters for you already, you may use the same strategy to solve the rest. So, right now, you may go back to the question now. However, if you are in a hurry or you are excited about the answer, you may click here.