David Costello (he/him/his)
David is a principal, who taught and had various board roles in Prince Edward Island. David has also instructed university courses regarding curriculum, differentiation, mathematics, and literacy. He facilitates professional learning in mathematics and school development. Dr. David Costello has published four books, with two of his most recent books being: Messing Around with Math: Ready-to-Use Problems That Engage Students in a Better Understanding of Key Math Concepts, and Mathematizing Student Thinking: Connecting Problem Solving to Everyday Life and Building Capable and Confident Math Learners.
2026 Sessions
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What’s Missing In Math Instruction
Discover four simple shifts in instruction that will help students demonstrate what they know in the classroom and on any test. Each shift is supported… Read More →
2025 Sessions
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Does Your Answer Make Sense?
Students are often asked in math if their answer makes sense. And, they will often say yes – regardless if their work is correct or… Read More →