Grade 9 Mathematics (MTH1W) ๐
Ontario Curriculum · Toronto District School Board · Curated Video Lessons
This guide covers all six strands of Ontario's de-streamed Grade 9 Mathematics course (MTH1W), introduced in 2021. Each section links to a high-quality video lesson to help you build confidence in every topic — from number sense and algebra to financial literacy.
๐ข Rational & Irrational Numbers
Grade 9 Number begins by expanding your understanding of the number system — integers, fractions, decimals, and the distinction between rational and irrational numbers. This lesson introduces number sets clearly, showing how every rational number can be expressed as a fraction and how irrational numbers like √2 and ฯ sit outside that system.
- Number Sets
- Rational Numbers
- Irrational Numbers
- Integers & Fractions
Source: Math 9 Curriculum Series
⚡ Exponents & Scientific Notation
Exponent laws and scientific notation are cornerstones of the Number strand. This lesson from The Organic Chemistry Tutor gives a clear, step-by-step walkthrough of expressing very large and very small numbers in scientific notation — a critical skill across mathematics, science, and real-world data.
- Scientific Notation
- Powers of 10
- Exponent Laws
- Conversion Practice
Source: The Organic Chemistry Tutor
๐งฎ Polynomial Expressions
The Algebra strand opens with polynomial expressions — learning to identify terms, coefficients, and degrees, then simplifying by collecting like terms and applying the distributive property. Math Antics provides an accessible and visual introduction to what algebra is and how expressions are structured, setting a firm foundation for everything that follows.
- Variables & Terms
- Collecting Like Terms
- Distributive Property
- Adding & Subtracting Polynomials
Source: Math Antics
⚖️ Solving Linear Equations
Once you can write algebraic expressions, the next step is solving equations — isolating the unknown variable using inverse operations. This Math Antics lesson tackles two-step equations with clarity and visual flair, covering the exact techniques you'll need to solve multi-step problems throughout the MTH1W course.
- Inverse Operations
- Two-Step Equations
- Balance Method
- Checking Solutions
Source: Math Antics
๐ Graphing Linear Relations
Linear Relations is one of the most important strands in Grade 9 Math. This video — made specifically for the Ontario Grade 9 curriculum — walks through how to create a table of values and plot a linear relation on a coordinate grid, including direct and partial variation. A must-watch for building strong graphing skills.
- Tables of Values
- Coordinate Grids
- Direct Variation
- Partial Variation
Source: Grade 9 Academic Math
๐ Slope & Rate of Change
Slope is the heartbeat of linear relations — it tells you how steeply a line rises or falls and what that means in real-world contexts like speed, cost per unit, or population growth. This lesson explains slope as rate of change and connects it to the equation y = mx + b, with worked examples throughout.
- Slope Formula
- Rise over Run
- Rate of Change
- y = mx + b
Source: MaffsGuru
๐ The Pythagorean Theorem
The Pythagorean Theorem (a² + b² = c²) is an essential tool in geometry for finding unknown side lengths of right triangles — and it appears in surface area, volume, and coordinate geometry too. Math Antics explains it visually and intuitively, then walks through multiple practice problems to make it stick.
- Right Triangles
- Hypotenuse
- a² + b² = c²
- Missing Side Lengths
Source: Math Antics
๐ฆ Surface Area & Volume
From rectangular prisms to cylinders and pyramids, the Geometry & Measurement strand asks you to calculate surface area and volume for a variety of 3D shapes. This Grade 9-specific lesson builds the formulas from first principles, showing where each formula comes from and how to apply it to real-world objects.
- Prisms & Cylinders
- Pyramids & Cones
- Surface Area Formulas
- Volume Formulas
Source: Grade 9 Mathematics
๐ Mean, Median & Mode
Data literacy begins with the three measures of central tendency: mean (average), median (middle value), and mode (most frequent value). Khan Academy's introductory statistics lesson explains when each measure is most useful, how to calculate all three from a data set, and how outliers can affect your interpretation of data.
- Mean (Average)
- Median
- Mode
- Outliers & Spread
Source: Khan Academy
๐ฐ Compound Interest & Personal Finance
Ontario's Grade 9 Mathematics curriculum includes a dedicated Financial Literacy strand — covering budgeting, simple and compound interest, appreciation, and depreciation. Khan Academy's compound interest introduction shows the powerful difference between earning simple versus compound interest over time, with clear examples that connect directly to the MTH1W curriculum expectations.
- Simple Interest
- Compound Interest
- Budgeting
- Appreciation & Depreciation
Source: Khan Academy
Built for TDSB students taking MTH1W – Ontario's de-streamed Grade 9 Mathematics course (2021 curriculum)
Comments
Post a Comment