Mathematics
Secondary School Mathematics Department
Our Mission
Working to build on the current math skills students have acquired, our mathematics department will increase student understanding of mathematical concepts and practical application. Students can choose from courses in Algebra, Geometry, Pre-Calculus, or Consumer Math. Students be encouraged in cooperative work and communication skills so as to be respectful of each other and have fun learning.
Kevin Kelderman
Teaching and coaching at North Mahaska for over 24 years, Kevin Kelderman has enjoyed serving our students since he began his student teaching. He currently coaches baseball, basketball, and football. Kevin graduated from William Penn College and his wife Carmen also works at North Mahaska as a high school associate. Kevin and his family, which includes their 3 children, live here in New Sharon.
Email: keldermank@nmwarhawks.org
Phone: (641) 637-4187
Shayla Schilling
Teaching here at North Mahaska for over 20 years, Shayla Schilling specializes in mathematics and is our math instructional coach and interventionist. She attended University of Northern Iowa where she majored in elementary education with a minor in Spanish. She has also worked as a third, fifth, and sixth grade teacher and with the TAG program here at North Mahaska. Shayla feels privileged to spend her teaching career here amongst the best students and staff members.
Email: schillings@nmwarhawks.org
Phone: (641) 637-4041
Jana Boonstra
Jana Boonstra began teaching at North Mahaska in the fall of 2022, bringing over 25 years of experience in education. She currently teaches 7-12 Math and coaches Cross Country. She graduated from Trinity Christian College in Palos Heights, Illinois, with a double major in Elementary Education and Mathematics. She and her husband reside in New Sharon and have three children.
Email: boonstraj@nmwarhawks.org
Phone: 641-637-4187
Karen Harrill
Karen Harrill teaches Geometry and Eighth Grade Math Applications. She brings five years of experience in education, complemented by numerous years in private business. She lives in Pella with her husband, Rick, and is a proud UNI graduate. She has three children: Amanda, Natalie, and Karson. She’s excited to join the North Mahaska staff and community and enjoys travel, coaching, baking, and reading.
Email: harrillk@nmwarhawks.org
Phone: 641-637-4187