The Hidden Math Skills Students Lose Over Summer Break: What Canadian Research Shows

Every September, teachers across Canada notice the same pattern: students return to school needing significant review in math. While the size of the “summer slide” varies across studies, Canadian and international research still agrees on one thing – that math skills decline more than reading skills during long breaks, especially for students without structured learning opportunities.

What Canadian‑Relevant Research Shows About Summer Learning Loss

Canadian education researchers and policy organizations highlight several consistent findings:

• A major review of 39 studies found students lose about one month of learning over the summer, with math losses greater than reading losses (Cooper et al, 1996).
• Canadian policy reviews of international research show math skills are the most vulnerable, especially computation and problem‑solving (Canadian Council on Learning, 2009).
• Canadian teachers commonly report spending the first month of school on review and diagnostic assessment, particularly in mathematics, a pattern supported by the Canadian Council on Learning’s findings on summer learning loss (2009).

What is clear from the research is that:

• Students make little or no academic progress during summer.
• Math declines more consistently than reading.
• Students with fewer learning supports are disproportionately affected (Davies & Aurini, 2013).

Why Math Declines More Than Other Subjects

Across Canadian and international research, math stands out as the subject most likely to erode because:

• Math learning is cumulative, so forgetting one concept disrupts the next.
• Students rarely encounter structured math practice in daily life.
• Procedural fluency, number sense and other foundational skills weaken quickly without repetition, and so are most affected by summer learning loss (Canadian Council on Learning, 2009; Munro, 2022).
• Students with limited enrichment experience larger skill gaps by September (Davies & Aurini, 2013).

This aligns with what teachers across Ontario and other provinces report every fall.

The Long‑Term Impact for Canadian Students

Repeated summer regression can:

• Widen achievement gaps year after year.
• Reduce students’ confidence in math.
• Slow progress in cumulative strands like number sense, algebra, and proportional reasoning.
• Require teachers to spend weeks reteaching instead of advancing new curriculum expectations.

Modest losses compound over time, especially in math.

How Mathnasium Helps Prevent Summer Slide

Mathnasium’s summer programs are designed to directly counter the patterns identified in Canadian research:

• Individualized learning plans target the exact skills most at risk.
• Consistent, structured practice keeps number sense and fluency strong.
• Engaging instruction helps students rebuild confidence and momentum.
• Diagnostic assessments identify gaps created during the school year or over summer.

Instead of losing ground, students can enter September ahead of where they finished in June - a major advantage in cumulative subjects like math.

The Takeaway for Canadian Families

The research is clear:

• Math skills fade without practice.
• Losses accumulate over multiple summers.
• Students with fewer learning opportunities are hit hardest.
• Early, consistent intervention makes the biggest difference.

A structured summer math program is protection against predictable skill loss.

References: 

Canadian Council on Learning. (2009). Lessons in learning: Summer learning loss. Canadian Council on Learning.

Cooper, H., Nye, B., Charlton, K., Lindsay, J., & Greathouse, S. (1996). The effects of summer vacation on achievement test scores: A narrative and meta‑analytic review. Review of Educational Research, 66(3), 227–268.

Davies, S., & Aurini, J. (2013). Summer learning inequality in Ontario. Canadian Public Policy, 39(2), 287–307.

Munro, C. (2022). Learning loss: A summer problem. BU Journal of Graduate Studies in Education, 14(2), 29–33.