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Everything I have read says no, do not put your GMAT score on your resume. In the consulting field, top firms ask for your GMAT score, but no one else cares. A 640 is a nice score but not a stellar one, so I wouldn't put it on anyway, but as others said, it would only really go on for your b-school app. Then again, they have a spot for it on the application, so it's not needed on the resume.
Long-winded answer, but listen to what everyone's telling you: leave it off.
Don't put it on your resume. Thats like putting your SAT on a resume. Companies dont care at this point. You aren't even supposed to put it on your resumes for B-school since the applications have spots for it and at interviews they usually want to be gmat score blind.
The only resume you put your GMAT on is for internships and right after school. Even then only certain employers, in certain industries care.
I love hearing stories like your husbands. I have a friend who was close to morbidly obese, he weighed 300+ a couple years ago. He was really into MMA and decided that BJJ would force him to exercise cause if he didnt he would get beat up. He has started fighting at 205 now and hopes to be down to 185 in the near future.
Only bad thing is going to work with a black eye and explaining what happened. Or even worse, like gmatblackbelt, breaking something and missing work because of that.