5 Smart Investing Strategies The slideshow presentation that you would like to view is too large for your current screen resolution. Click here to view to view the slideshow at full resolution. Launch Presentation » Share | Related Content The Rule of 72 Do you know how long it may take for your investments to double in value? The Rule of 72 is a quick way to figure it out. Four Really Good Reasons to Invest There are four very good reasons to start investing. Do you know what they are? How Compound Interest Works Use this calculator to better see the potential impact of compound interest on an asset.