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Simon Yeend is an author and former sports journalist.

Tracie Young is a maths teacher, numeracy coordinator, maths tutor and all-around maths nut. Tracie teaches maths trics in class to engage her students and sometimes set them wrong. This is her first book.

NICOLA YOON is the #1 New York Times bestselling author of Instructions for Dancing; Everything, Everything; and The Sun Is Also a Star. She is a National Book Award finalist, a Michael L. Printz Honor Book recipient, and a Coretta Scott King New Talent Award winner. Two of her novels have been made into major motion pictures. She’s also copublisher of Joy Revolution, a Penguin Random House young adult imprint dedicated to love stories starring people of color.