Learn Excel in 15 Seconds – Quick, Easy & Free Excel 15 Second Video Tutorials. Quickly Learn Basic Formulas & Functions. March 8, 2017 9:05 pm Tutorial 01: How to Add, Subtract, Multiply & Divide Numbers in Excel – Easy Excel Formula Tutorial 02: How to use Cell-References in Excel Formulas Tutorial 03: How to Copy-Paste-Drag-Double-Click. The 3 most common ways of copying an excel formula are shown Leave a Reply Cancel reply Your email address will not be published. Required fields are marked *Comment Name * Email * Website Save my name, email, and website in this browser for the next time I comment.