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 five books, with two of his most recent books being: What’s Missing in Math Instruction: Test Preparation and Classroom Strategies That Show Students How to Apply What They Know in Meaningful Ways, and Messing Around with Math: Ready-to-Use Problems That Engage Students in a Better Understanding of Key Math Concepts
2027 Sessions
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 →