Bad at Math

Yesterday I went to get a haircut.  The hairdresser asked how I wanted it cut.  I said what I always say: cut it to a quarter-inch on the sides and back, and to three-quarters of an inch on the top.

She asked what the numbers were, meaning the randomly-assigned numbers shown on the clipper attachments which correspond to the various lengths.  I said I didn’t know, but that I thought the actual lengths in inches were shown on the attachments, too.

She said yes, they were, and she had little trouble finding the quarter-inch attachment.  But after some digging through the attachment bin for the three-quarters attachment, she produced one and showed it to me.  It said "3/8".  I said, "ah... no, it will say ’three over four’ on it."

She said, "I’m really bad at math."