1. The problem statement, all variables and given/known data If each letter stands for a number from 0 to 9 (and different letters stand for different numbers), find the numerical value of each letter in this addition: 2. Relevant equations 3. The attempt at a solution (1) N + D = R (2) I + I = E ----> I = E/2, which means E must be even (3) R = E These were my initial conjectures. However, I now feel that they are wrong. At first, I thought that there was no carrying over of digits--which would be a helpful fact--; then I realized that D was in the 1000's place, which implies that there must have been some carrying over. Could someone help me?