Halloween math activities for 3rd grade: Frankenlines and monster arrays

I’m so excited to introduce you to Rebecca Krupp! If you’re a fan of the book EduMagic, you may recognize her from the chapter on breaking out of your regularly scheduled programming with her innovative Genius Corps program. Rebecca is currently student teaching in 3rd grade and has shared some fantastic Halloween math activities for 3rd grade that are easy to implement and full of fun. Enjoy!

Halloween math activities for 3rd grade: Frankenlines: Multiplication with a Twist

It’s fall in 3rd grade, and Rebecca’s students have been diving into a variety of Halloween-themed math activities. When she began her student teaching placement, her cooperating teacher was wrapping up a project called Frankenlines. This activity helped students practice using number lines to solve multiplication problems—with a spooky twist! Students decorated their number lines to look like Frankenstein, combining math practice with creativity. The finished Frankenlines now decorate the classroom walls, adding a festive touch and reinforcing key math concepts.

Halloween math activities for 3rd grade: Monster Arrays

Next up was an engaging lesson on arrays. Students quickly discovered how arrays can be used to solve multiplication problems. To bring this concept to life, they created Monster Arrays using googly eyes. Each student was assigned a multiplication equation and built an array to match. Then, they transformed their array into a monster and wrote the corresponding multiplication sentence. These adorable monsters now hang in the hallway beneath the Frankenlines, showcasing both creativity and math skills.

Halloween math activities for 3rd grade: Pattern Hunt Paint-by-Numbers with a Purpose

This week, Rebecca’s class is exploring number patterns to develop number sense and enhance problem-solving skills. As a fun closing activity, students will complete a paint-by-numbers worksheet focused on patterns in 2s, 5s, and 10s. By identifying number patterns, students will determine which colors to use—and when they finish, a hidden picture will be revealed! This activity reinforces math strategies while keeping students engaged.

Rebecca Krupp is a preservice teacher studying elementary and special education at Grove City College. She’s also the founder of @thegeniuscorps, a program that connects middle school students with local colleges to provide high-quality, accessible science experiences. Her favorite color is brown, and she loves the mountains!

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