“Dr. David Costello provides helpful and useful resources for mathematics teachers to use in their classrooms. He delivered meaningful webinars that emphasized mathematical discourse and literacy among face-to-face, blended, and online mediums. He values the teaching profession and helped us work with our mathematics teachers across the state”.

“Demonstrating a strong understanding of implementing numeracy in the classroom, David Costello effectively highlights the importance of focusing on the process behind the product. He offers practical, effective strategies to help educators dive deeper into mathematical thinking with their students”.

“Before working with Dr Costello, my school was consistently doing poorly on our standardized math assessments. David facilitated PD on core concepts and highlighted how to strengthen student understanding of these through manageable instructional practices. From this, our school is now scoring above the provincial average and teachers are seeing substantial improvements in student math understanding. We would love to work with him again! “

“My staff are enthusiastic about David’s work. They have developed professional development goals and growth plans focused on his work. Many have already ordered his latest book and are already talking about next year’s goals. I love that David’s work is motivating, practical and teacher-friendly”.

“Teaching a combined grade class is very challenging. I felt as though I was teaching two separate lessons each day. When I started working with David Costello, I started to see the connections among various concepts and how math is a continuum. Along with this, his instructional strategies helped me differentiate between grade-level content and the learning needs of my students. It has completely reinvigorated me and how I see math. I would recommend Dr. Costello’s work to any math teacher.”

“Highly engaging and informative, Dr Costello offers great strategies for both educators and students to go beyond the surface of mathematical thinking. Educators left his webinar feeling inspired to dive deeper into problem-solving with their students”.

“Dr. Costello provided our staff with training that was relevant to our school goals and ready to use right away. The training was fun, and my teachers began to put what they learned to work the very next day. We look forward to working with him again in the future”.

“Our staff collaborated with David on his book, Using What Works. With David’s support, we were able to interrogate the strategies we use in our mathematics classes, and how we can create the environment and learning opportunities that lead our students to better understand. David has helped us to impact our instruction, and thus student learning, by using literacy-rich intentionality and planning to support our learners with strategies that work. Through our professional learning with David, we have been able to dive deeply into the continuum of building mathematics strategies and bring our learning into our classrooms”.