A Mysterious Will Launches The Math Kids Into Their Riskiest Adventure Yet! 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! This Middle Grade Book - introduces readers to mathematical patterns - features an action-packed plot with international intrigue - includes an appendix for hand-on learning "The Triangle Secret continues a streak of fun mystery adventures." -- Ho Lin ― Foreword Reviews 2022 finalist - Juvenile Fiction for the Forward Reviews Indie Award ― Forward Reviews Indie Award 2022 finalist - Juvenile Fiction for the Forward Reviews Indie Award "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 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. 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. 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 shannonotooleart.com or follow her on Instagram @shannonotooleart. ​ Chapter 1 Jordan Waters let out a contented sigh as he looked around his fifth-grade classroom. He felt like things were finally back to normal. The school year had started off very badly. Jordan and Justin Grant, his best friend since kindergarten, had been put into one class. The other half of the Math Kids, Stephanie Lewis and Catherine Duchesne, had been placed in Mrs. Wilson’s class. To make matters even worse, Mr. Miller, his new teacher, had made it quite clear he was not a fan of anything to do with math. Luckily, the Math Kids had been able to use their math skills to prove that Mr. Miller’s son had been falsely accused of reckless driving. To return the favor, Mr. Miller had pulled a few strings and got Stephanie and Catherine moved into his class. The Math Kids were reunited, and things were right with the world. Mr. Miller had put them in the same math group, and now they had time to work together on difficult math problems. There was nothing better than a tough math challenge as far as Jordan and his friends were concerned. This time the problem came from Catherine’s dad. He taught math at the college and had even written some of his own math books. Mr. Duchesne knew his daughter and her friends loved math and always had a new problem for them to solve. In fact, it was solving a math problem that first introduced them to the math professor. When Mr. Duchesne had been kidnapped, he wrote Catherine a secret message that she and her friends solved using the Fibonacci series, a famous math pattern. The Math Kids had figured out the clue and were able to rescue him. That was also when the four friends had met FBI Special Agent Carlson, who had been assigned to the kidnapping case. That introduction had led to the agent asking the Math Kids to assist the FBI on a cold case involving a bank robbery, and from there an unlikely friendship had developed between them. “Okay, here’s the problem,” Catherine said as she read from a sheet of paper. “The new ice cream store has sixteen flavors of ice cream. How many ways can they make a three-scoop ice cream cone?” “Does the order of the scoops matter?” Stephanie asked. “That’s a great question, Stephanie,” Justin said. “That makes a big difference when you’re counting up the total number of possible combinations.” “It says the order of the scoops doesn’t matter, just the flavors that end u