Mathmo is a revision tool for post-16 mathematics. It's great installed as a smartphone app, but it works well in pads and desktops and notebooks too. Give yourself a mathematical workout!

This is our collection of tasks on the mathematical theme of 'Population Dynamics' for advanced students and those interested in mathematical modelling.

First in our series of problems on population dynamics for advanced students.

Explore the properties of this different sort of differential equation.

An advanced mathematical exploration supporting our series of articles on population dynamics for advanced students.

Fifth in our series of problems on population dynamics for advanced students.

Sixth in our series of problems on population dynamics for advanced students.

An advanced mathematical exploration supporting our series of articles on population dynamics for advanced students.

Fourth in our series of problems on population dynamics for advanced students.

Find the relationship between the locations of points of inflection, maxima and minima of functions.

Second in our series of problems on population dynamics for advanced students.

Consider these analogies for helping to understand key concepts in calculus.

Get started with calculus by exploring the connections between the sign of a curve and the sign of its gradient.

Third in our series of problems on population dynamics for advanced students.

Make a functional window display which will both satisfy the manager and make sense to the shoppers

Can you find a quadratic equation which passes close to these points?

Can you sketch these difficult curves, which have uses in mathematical modelling?

Can you hit the target functions using a set of input functions and a little calculus and algebra?

What functions can you make using the function machines RECIPROCAL and PRODUCT and the operator machines DIFF and INT?

Can you find the maximum value of the curve defined by this expression?

How would you sort out these integrals?

Fractional calculus is a generalisation of ordinary calculus where you can differentiate n times when n is not a whole number.

Here explore some ideas of how the definitions and methods of calculus change if you integrate or differentiate n times when n is not a whole number.

You can differentiate and integrate n times but what if n is not a whole number? This generalisation of calculus was introduced and discussed on askNRICH by some school students.

Show without recourse to any calculating aid that 7^{1/2} + 7^{1/3} + 7^{1/4} < 7 and 4^{1/2} + 4^{1/3} + 4^{1/4} > 4 . Sketch the graph of f(x) = x^{1/2} + x^{1/3} + x^{1/4} -x

Two circles of equal size intersect and the centre of each circle is on the circumference of the other. What is the area of the intersection? Now imagine that the diagram represents two spheres of. . . .