A player has probability 0.4 of winning a single game. What is his
probability of winning a 'best of 15 games' tournament?
In four years 2001 to 2004 Arsenal have been drawn against Chelsea
in the FA cup and have beaten Chelsea every time. What was the
probability of this? Lots of fractions in the calculations!
You have two bags, four red balls and four white balls. You must
put all the balls in the bags although you are allowed to have one
bag empty. How should you distribute the balls between the two. . . .
See how differential equations might be used to make a realistic
model of a system containing predators and their prey.
Explain why, when moving heavy objects on rollers, the object moves
twice as fast as the rollers. Try a similar experiment yourself.
This problem opens a major sequence of activities on the mathematics of population dynamics for advanced students.
Third in our series of problems on population dynamics for advanced students.
Second in our series of problems on population dynamics for advanced students.
First in our series of problems on population dynamics for advanced students.
How do these modelling assumption affect the solutions?
A car is travelling along a dual carriageway at constant speed. Every 3 minutes a bus passes going in the opposite direction, while every 6 minutes a bus passes the car travelling in the same. . . .
It is possible to identify a particular card out of a pack of 15
with the use of some mathematical reasoning. What is this reasoning
and can it be applied to other numbers of cards?
Fifth in our series of problems on population dynamics for advanced students.
Mike and Monisha meet at the race track, which is 400m round. Just to make a point, Mike runs anticlockwise whilst Monisha runs clockwise. Where will they meet on their way around and will they ever. . . .
Fourth in our series of problems on population dynamics for advanced students.
Chris is enjoying a swim but needs to get back for lunch. If she can swim at 3 m/s and run at 7m/sec, how far along the bank should she land in order to get back as quickly as possible?
Why MUST these statistical statements probably be at least a little
An advanced mathematical exploration supporting our series of articles on population dynamics for advanced students.
PhysNRICH is the area of the StemNRICH site devoted to the mathematics underlying the study of physics
In this article for teachers, Alan Parr looks at ways that
mathematics teaching and learning can start from the useful and
interesting things can we do with the subject, including. . . .
engNRICH is the area of the stemNRICH Advanced site devoted to the mathematics underlying the study of engineering
See how the motion of the simple pendulum is not-so-simple after
bioNRICH is the area of the stemNRICH site devoted to the
mathematics underlying the study of the biological sciences,
designed to help develop the mathematics required to get the most
from your. . . .
chemNRICH is the area of the stemNRICH site devoted to the
mathematics underlying the study of chemistry, designed to help
develop the mathematics required to get the most from your study. . . .
Invent scenarios which would give rise to these probability density functions.
This is the section of stemNRICH devoted to the advanced applied
mathematics underlying the study of the sciences at higher levels
Look at the calculus behind the simple act of a car going over a
Work in groups to try to create the best approximations to these
Sixth in our series of problems on population dynamics for advanced students.
The builders have dug a hole in the ground to be filled with concrete for the foundations of our garage. How many cubic metres of ready-mix concrete should the builders order to fill this hole to. . . .
Simple models which help us to investigate how epidemics grow and die out.
The probability that a passenger books a flight and does not turn
up is 0.05. For an aeroplane with 400 seats how many tickets can be
sold so that only 1% of flights are over-booked?
The third installment in our series on the shape of astronomical systems, this article explores galaxies and the universe beyond our solar system.
To win on a scratch card you have to uncover three numbers that add
up to more than fifteen. What is the probability of winning a
At Holborn underground station there is a very long escalator. Two
people are in a hurry and so climb the escalator as it is moving
upwards, thus adding their speed to that of the moving steps. . . .
Problem solving is at the heart of the NRICH site. All the problems
give learners opportunities to learn, develop or use mathematical
concepts and skills. Read here for more information.
Your school has been left a million pounds in the will of an ex-
pupil. What model of investment and spending would you use in order
to ensure the best return on the money?
This article for students introduces the idea of naming knots using numbers. You'll need some paper and something to write with handy!
A brief video explaining the idea of a mathematical knot.
The shortest path between any two points on a snooker table is the straight line between them but what if the ball must bounce off one wall, or 2 walls, or 3 walls?
Given the graph of a supply network and the maximum capacity for
flow in each section find the maximum flow across the network.
At what positions and speeds can the bomb be dropped to destroy the
The second in a series of articles on visualising and modelling shapes in the history of astronomy.
This article explores ths history of theories about the shape of our planet. It is the first in a series of articles looking at the significance of geometric shapes in the history of astronomy.
Fancy a game of cricket? Here is a mathematical version you can play indoors without breaking any windows.
This is about a fiendishly difficult jigsaw and how to solve it
using a computer program.
This is our collection of tasks on the mathematical theme of 'Population Dynamics' for advanced students and those interested in mathematical modelling.