Index - topics beginning with C.
| Topic area | Sub-topic |
| Calculator | Using the Casio fx-82AU Plus to calculate basic statistics. |
| Calculus | Introduction. |
| Reverse Chain Rule | Basic functions |
| Logarithmic and exponential functions. | |
| Trigonometric functions. | |
| Calories (in food) | See Energy & Mass Main Page. |
| Car expenses | Overview of main issues. |
| Car insurance. | Overview of main types. |
| Catenary function. | Quadratics - main page (its like a parabola in its shape. |
| Circles. | Circles - Main page. |
| Circle geometry. | Circles - Main page. |
| Changing the subject | Algebra - Main page. |
| Clark's formula | Algebra - main page (medication). |
| Completing the square | Algebra - Factorisation - main page. |
| Compound interest | Investments. |
| Continuity | Algebra & Functions. |
| Cosine rule | See Measuring Angles - Cosine rule. |
| Credit cards. | Financial maths - Main Page.. |
| Cross-method. | Factorising monic and non-monic quadratics. |