Donna M. Mosch Craft Murdock retired in 2008 after teaching for 38 years in grades 4 - 6. As a graduate of Elmira College, her first 17 years were spent teaching in Elmira, NY for the Rochester Diocese. The remaining time was in Williamsburg, VA. During this time she took numerous courses from Shenandoah University and The College of William and Mary. She retired from York County School Division where she taught 5th grade. Her notes that she gave her math students (the basis for this book) have helped her many students excel on their 5th grade math SOL (Standard of Learning) test.