To add check mark in the excel document use Wingdings font located on insert tab in Symbols group on your excel ribbon. The font options box provides an option of several control mark characters to insert in the document.
Choose the control mark. It is located near the end of symbols options box. Select Insert and then close. Select from any sort of several distinct types of control mark symbols offered. To insert one or more check mark, go on to select insert the select Close when finished with the insertions.