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The Triangle Secret

The Math Kids



David Cole

Shannon O'Toole

When FBI Special Agent Carlson is kidnapped while investigating the plane crash of Willard Howell, an eccentric billionaire inventor, the Math Kids spring into action.

If Catherine, Stephanie, Justin, and Jordan can figure out the Great Triangle mentioned in Howell's will, they might just uncover who's behind the crash and Agent Carlson's kidnapping—if they don't get caught themselves! 

The Math Kids: The Triangle Secret is the sixth book in the Math Kids series.

2022 Purple Dragonfly Award – First Place: Mystery

2022 Purple Dragonfly Award – First Place: Middle Grade Fiction

2022 Purple Dragonfly Award – First Place: STEM

2022 INDIES Finalist – Juvenile Fiction (Children's)


April 4, 2022

184 Pages | 6 × 9

Middle Grade (10-12)

ISBN 9781988761626



"Sure to excite and engage our young math enthusiasts" – Story Monsters Ink

"A great way of reinforcing mathematics through an appealing adventure"  – D. Donovan, Sr. Reviewer, Midwest Book Review

"Exceptional, like all the others of the series" – CM: Canadian Review of Materials

About the Author:

David Cole has been interested in math since he was a very young boy. He pursued degrees in math and computer science and has shared this love of math at many levels, including teaching at the college level, coaching elementary math teams, and running a summer math camp. He also has a love of writing and has written a number of plays that have been performed. The Math Kids was born of a desire to combine his interests and exercise both sides of his brain at the same time. Find him on his website or on Facebook, Twitter, and LinkedIn.

About the Illustrator:

Shannon O'Toole is a Toronto based illustrator, painter and elementary school teacher. Her playful illustration work is inspired by the unique and humorous characters in her life. Aside from illustrating books for children, Shannon has exhibited her artwork in galleries across Ontario. When she is not drawing, Shannon can be found curled up with her dog, Edgar watching old movies. You can visit her online at or follow her on Instagram @shannonotooleart

Related Titles:

The Math Kids The Prime-Time Burglars

The Prime-Time Burglars

The Math Kids An Encrypted Clue

An Encrypted Clue

The Math Kids An Artificial Test

An Artificial Test

The Math Kids A Sequence of Events

Sequence of Events

The Math Kids An Incorrect Solution

An Incorrect Solution

The Math Kids An Unsolved Proof

An Unsolved Proof

The Math Kids An Unusual Pattern

An Unusual Pattern

The Math Kids A Knotty Problem

A Knotty Problem

The Math Kids The Election Calculation

The Election Calculation

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