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Year 9 maths topics
Key Stage 3 · ages 13 to 14 · 13 topics first taught in Year 9. Earlier topics keep coming back in review.
Number
- Budgets: Use percentages and fractions of income to plan spending and saving.
- Standard form: first steps: Write large and small numbers as a number between 1 and 10 times a power of ten, and multiply them.
Algebra
- Equation of a straight line: Use y = mx + c: find the gradient and intercept, and work out a point on the line.
- Gradient of a straight line: Find how much y changes for each unit of x.
- Laws of indices: Simplify powers of the same number when multiplying, dividing and raising to a power.
Measures
- Volume of a cylinder: Find the volume of a cylinder from its radius and height.
- Volume of prisms: Find the volume of a prism from its cross-section and length.
Geometry
- Angles in polygons: Interior and exterior angles.
- Bearings: Use three-figure bearings, and find the back bearing.
- Circumference of a circle: Find the distance around a circle using π.
- Pythagoras' theorem: Find missing sides of right-angled triangles.
Statistics
- Scatter graphs and correlation: Describe the type of correlation shown by data, and know that correlation is not cause.
- Venn diagrams: Use Venn diagrams to find how many are in both sets, either, or neither.