Math Department

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Welcome to the Math Department!

  • Thank you for visiting the Riverdale Ridge’s Math Department site!

    We believe that students should appreciate the beauty, fun, and power of mathematics.  To that end, we engage students in collaborative, real-world applications with the hope that they can apply the math they learn in class to situations outside of school.  

    We encourage the development of thinking and communication skills, as well as familiarity with technology.  We believe that students need to learn to work and communicate with diverse groups of people of varying abilities who come from a variety of cultures.

    We are excited to teach your students!  Thanks again for visiting.


Meet Our Math Team!

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Degrees and Certifications:

B.S. in Mathematics- Secondary Education

Ms. Jill Castiglia

Ms. Castiglia was born and raised in the suburbs of Chicago (Go Cubs!), and graduated from Illinois State University. She taught and coached for 5 years in the Chicago area before following her heart and moving to the mountains! Ms. Castiglia then spent 5 years teaching in East TN just outside The Great Smoky Mountains, in which she created the very first hiking club there for students!

Moving here to CO has been her dream and she beyond happy to call it home for the past 2 years. This year will be Ms. Castiglia's 3rd year teaching at RRHS! Teaching is her passion and she loves helping students not only achieve in math, but also to accomplish any goals they set for themselves in life! Students make an impact in her life, and she truly couldn't see herself doing anything else!

Other than teaching math being a passion, Ms. Castiglia spends majority of he free time exploring the mountains-- hiking, camping, biking, traveling to our National Parks throughout the country, and also face-timing with her niece, Zoey, and nephew, Henry, back in IL!

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Degrees and Certifications:

Bachelor's - Math, Master's - Curriculum & Instruction

Mrs. Krysta Daigle

Mrs. Daigle grew up outside of Phoenix, AZ. After high school, she attended Concordia University-St. Paul and earned her bachelors in Mathematics. She also played Division II soccer at Concordia and was a 3-year starter. Following graduation, she moved to Jacksonville, FL where she taught for 4 years. In June 2012, she moved to Colorado and is here to stay. Later she earned her masters in Curriculum and Instruction. Mrs. Daigle has taught at Riverdale Ridge since it opened in 2018. Over the past 14 years of teaching, she has taught math courses ranging from Algebra to Pre-Calculus. She has also enjoyed coaching volleyball, soccer, and track throughout her career. She now coaches her daughter’s club soccer team. Mrs. Daigle loves teaching math, connecting with her students, and helping them grow into well-rounded individuals. Her energy and excitement to teach and learn math is contagious and helps her students to get excited about learning as well. She is most excited about building comradery among students and staff, and continuing to develop a great culture at Riverdale Ridge! She is thankful for her supportive husband, and two daughters ages 7 and 9.

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Degrees and Certifications:

Bachelor of Science in Math Education, Master of Arts in Math Education

Mrs. Chelsea Frye

Mrs. Frye grew up in Aurora, CO and then attended Colorado State University in Fort Collins to earn her Bachelor's degree in Mathematics with an emphasis in Education. She started her Master's degree in teaching Mathematics while teaching at Greeley West High School the following year. She then taught at Brush High School and Fort Morgan High School before moving to Riverdale Ridge.

Mrs. Frye has taught classes ranging from Pre-Algebra to College Trigonometry. She has also been involved with the student council at her previous schools.

Mrs. Frye was married on the perfect Pi Day (March 14, 2015) to her husband Kellen who is also a math teacher. They have two children, Phillip and Blythe, and a dog named Digit. She has grown up attending CSU football games and is now carrying on the tradition by taking her children with her (Go Rams)!

What Mrs. Frye loves most about Riverdale Ridge is getting to start new school traditions, being a part of a school that feels like family, and living the way of the Raven!

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Degrees and Certifications:

Bachelor of Science Degree in Mathematics with an emphasis in Secondary Education from Colorado State University. Master of Science Degree in Education with an emphasis in Integrating Technology in the Classroom from Walden University. Master's Degree - Education with an Emphasis in Integrating Technology in the Classroom - Walden University

Mr. Kellen Frye

Kellen Frye is starting his 10th year in education and 3rd year at Riverdale Ridge.

Prior to teaching in 27J, he taught in Morgan County School District RE3, both as a Computer Applications teacher as well as Math Intervention and middle school mathematics teacher.

His wife, Chelsea Frye, is also a math teacher at Riverdale Ridge High School. They have two children , with their oldest beginning Kindergarten this year.

He is very excited to start this school year and to continue to build a solid commUNITY with previous and current students and family memebers.

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Degrees and Certifications:

B.S in Mathematics, M.S in Secondary Education

Ms. Amanda Godin

This is Ms. Godin's second year at Riverdale Ridge High School. Before moving to Colorado, Ms. Godin lived in upstate New York. There she earned her B.S in Mathematics at St. Lawrence University. After graduating, Ms. Godin taught math for 6 years at the same high school she attended. In addition to teaching, Ms. Godin also coached soccer and track & field. In addition to teaching Ms. Godin enjoys travelling, running, hiking, baking, and reading! If you have any book recommendations send them my way!

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Degrees and Certifications:

BA Journalism, audio and video engineering. Certified to teach Math 6-12, History 7-12, PE K-12

Mr. Duke Kell

Duke Kell, teaches integrated Math 1, and is in his 22nd year in education. After teaching in Southern California and Hawaii, for the first 20 years he has moved back to the north Denver metro area to be closer to family. Duke is a registered member of the Citizen Potawatomi Nation. He loves sports, art and music and has a background in Audio and Video engineering. 

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Degrees and Certifications:

B.S. Secondary Education of Mathematics (Oklahoma State University); M.S. Teaching, Learning, and Leadership (Oklahoma State University)

Mr. Scott Pope

Scott Pope is new to Riverdale Ridge High School this year. He has taught math for his entire 20 year career and looks forward to bringing that experience to his Integrated Math 2 and AP Statistics classes. Mr. Pope is also an assistant coach for the Raven Wrestling Team.

When he's not at school, Mr. Pope enjoys hiking and photography. In 2019 he hiked all 2192 miles of the Appalachian Trail and in 2021 he hiked the 495 mile Colorado Trail.

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Degrees and Certifications:

Bachelor of Science in Interdisciplinary Studies with Concentrations in English, Education and French from Radford University, in Virginia.

Mrs. Cynnamon Rankens

Mrs. Cynnamon Rankens is very excited to get to work with the students, staff, and other stakeholders that call RRHS home while engaging her students in the world of mathematics!

Mrs. Rankens is a product of a military family but has always called Colorado home. Mrs. Rankens grew up in Arizona, Okinawa Japan, Oklahoma, California, Virginia, Florida and Colorado. The 22-23 school year will mark Mrs. Rankens' 14th year in education. She started her career in Virginia, then moved to Florida and finally Colorado. Mrs. Rankens has been in 27J for the last three years at Vikan Middle School. She holds a Bachelor of Science in Interdisciplinary Studies with Concentrations in English, Education and French from Radford University, in Virginia. Mrs. Rankens also holds a Math endorsement from Colorado Department of Education.

Mrs. Rankens is very passionate about fostering positive relationships of trust with her students and families in order to create a safe, positive and engaging learning environment in and out of the classroom. While math tends to be a struggle for many children, Mrs. Rankens works to encourage her students to persevere through their challenges and see that they CAN do math and that it can be achieved with little to no pain! (haha)

In her downtime, Mrs. Rankens likes to hike, explore the mountains, play in the snow and spend time with her family. She has a wonderful husband, two dogs, Mesa and Oz and two cats, Hemingway and Cirilla.

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Degrees and Certifications:

BS in Math with secondary education focus, certified 7-12 math.

Mr. Cord Sheard

Cord Sheard is a 5th year math teacher and Texas native who just recently escaped to beautiful Colorado. He graduated from Stephen F Austin State University in Nacogdoches, TX with a bachelor's degree of science in mathematics with a focus in secondary education. He has taught 7th grade math, geometry, and geometry honors. This year, he will be teaching integrated math 1 and integrated math year. Outside of school, Cord loves to read, cook, and play card and board games with his friends. The hardest thing about moving to Colorado for him was leaving his family, but he is excited and hoping to adjust soon. He is also extremely excited to be a raven and can't wait to see what this year has in store.

Providing a safe, supportive, and challenging learning community for ALL students to THRIVE!