Can't delete number field in a form

Can't delete number field in a form

I want to delete a number field. When I try to delete it I get the error message: "This field is referenced in the following places. Please remove them and then delete this field" It then lists 4 forms that I used this field in. When I go to each form, I can not find a way to remove the field from the form. In Column Properties, I can uncheck the "show" check box, but I can't find a way to remove the field from the form. Will someone please let me know what I am doing wrong? Thanks.