I teach 8th grade science and am continually amazed at the number of students who write the following:
I would minus this number by the first number to get my answer.
First of all the word minus cannot be used in this fashion but the "by" issue is one that confounds me. Am I crazy in thinking that this is incorrect? You would only use the word by if you were talking about multiplication. In my mind, the only correct options are: 1) I would subtract the first number from this number to get my answer or 2) I would take the difference between these numbers to get my answer.