Grade 9 De-streamed Math (MTH1W) — What Ontario Parents Need to Know
Since 2021, all Ontario Grade 9 students take the same math course: MTH1W (Mathematics, Grade 9, De-streamed). This was a major change from the previous system of “applied” and “academic” streams. Here’s what it means for your child.
What Is MTH1W?
MTH1W is the single Grade 9 math course that all Ontario students take, regardless of whether they plan to pursue university, college, or the workplace. The course covers:
- Number Sense: Rational numbers, powers, roots
- Algebra: Polynomials, expanding, simplifying, factoring
- Linear Relations: Rate of change, slope, y = mx + b, graphing
- Analytic Geometry: Distance, midpoint, equation of a line
- Financial Literacy: Simple/compound interest, budgeting, financial planning
- Data & Probability: One-variable statistics, data collection, analysis
- Coding: Intro to coding concepts applied to math (Python, Scratch)
Why Was Streaming Removed?
Research showed that the old streaming system — which separated students into “academic” and “applied” paths in Grade 9 — disproportionately affected students from lower-income families and racialized communities. Students placed in applied math had significantly fewer opportunities for post-secondary education.
De-streaming means every student gets the same rigorous math education, keeping all future pathways open.
The Grade 9 EQAO Assessment
Grade 9 EQAO is now digital and assesses the full MTH1W curriculum. Key differences from the elementary EQAO:
- Computer-based (students type responses)
- Covers the entire year’s curriculum
- Includes multi-step problems requiring mathematical reasoning
- Results affect OSSD (Ontario Secondary School Diploma) graduation literacy requirements tracking
What Your Child Needs to Know Going In
Success in MTH1W depends heavily on Grade 7 and 8 foundations. If your child enters Grade 9 with gaps, the pace of high school makes it very difficult to catch up.
Prerequisites your child should be comfortable with:
- Integer operations (Grade 7)
- Fraction and decimal operations (Grade 5–6)
- Solving two-step equations (Grade 7–8)
- y = mx + b and graphing (Grade 8)
- Pythagorean theorem (Grade 8)
- Area and volume calculations (Grade 6–8)
If any of these are shaky, summer bridging practice between Grade 8 and 9 is one of the highest-ROI investments you can make. Grade 8 review →
Tips for Success in Grade 9 Math
- Don’t fall behind: High school math moves fast. Missing two weeks of content creates a cascade. Daily practice prevents this.
- Master polynomials early: This is the new concept most students struggle with. Expanding (a + b)(c + d) and simplifying should become automatic. Algebra practice →
- Understand rate of change: Linear relations are the backbone of Grade 9 math (and Grade 10, 11, and 12). Invest time in truly understanding slope, not just calculating it.
- Use adaptive practice: MapleMath’s Grade 9 content adapts to your child’s level and covers all MTH1W strands.