Number Story Equations contains two worksheets containing number stories that require the students to identify the correct equation that goes with the number story. A Start-Change-End Diagram is included to assist students with each problem. All problems included on these worksheets start with an unknown addend. Answer keys are included. These worksheets meet or exceed the Common Core Standards of Mathematics by having the students understand 'change' number stories / word problems and identify the correct equation with a missing addend.