That seems very odd to me. I would expect most people should have learned the impact of this from the first time learning addition. I guess this is a good examp

That seems very odd to me. I would expect most people should have learned the impact of this from the first time learning addition. I guess this is a good example of why you can never assume to know how someone else thinks about information. | 5 |+ 10 |---- | 15 | 5 |+ 10 |---- | 15