The secondary section of *Free Math Games* will offer topics required by intermediate students from ages 11 to 16 in their study of math. We are currently projecting roughly 1000 topics will be required.

Topics will be divided into 6 top level categories: Number, Algebra, Ratio proportion rate, Geometry & measures, Probability and Statistics.

Each top level category will be divided into sub-categories. The sub-categories for Number are listed below (though not all age groups will see all sub-categories).

Order & compare, Powers & Roots, Multiples Factors Primes, Order of operations, Number machines, Fractions, Decimals, Percentages, Standard units, Rounding & estimating, Surds, Counting.

The sub-categories for Algebra are:

Algebraic notation, Forming expressions, Simplify expressions, Substitute in values, Factorise, Forming equations, Solving equations, Rearrange formulae, Equations & identities, Inequalities, Functions, Graphs, Sequences, Approximate solutions.

The sub-categories for Ratio proportion rate are:

Place value: measures, Imperial to metric, Metric to imperial, Ratio, Percentages, Proportions, Compound units, Scale.

The sub-categories for Geometry & measures are:

Circle, Measures of 2D shapes, Measures of 3D shapes, Measures of angles, Compass construction, Triangles, Pythagoras, Trigonometry, Quadrilaterals, Polygons, Transformations, Similar shapes, Vectors, Congruent shapes.

The sub-categories for Probability are:

Expressing probability, Venn and tree diagrams, Types of event.

The sub-categories for Statistics are:

Sets of numbers, Discrete data, Continuous data, Cumulative data, Two variables.