I'm sure that at some time in your life you've come across a magic square; usually a 4 x 4 table filled in with numbers where every row and column adds to give the same total. Here's an example where the total is 34 and, as a bonus, the two leading diagonals add to give 34 as well. Well, that's quite nice, but hasn't really got the wow factor, has it? The next one has, though: same numbers, filled in differently. It's ...

## Great Mathematicians 6: Isaac Newton

Newton is such a giant in the history of Maths and Physics that it isn't really possible to do him justice in a short blog post. King's School Grantham: original building Source: Acabashi, via Wikimedia Commons (CC BY-SA 3.0) The basic facts first. Newton was born in Lincolnshire, in eastern England, in 1642. His early family life was unhappy, but he had the fortune to go to a good school - the King's School in Grantham - which gave him an ...

## The Paradox of the Condemned Prisoner

The prison governor goes to visit a condemned prisoner in his cell. He tells him that he is due to be executed at midday one day in the following month, but he won't know in advance which day it is. Actually, condemned prisoners are a bit of a gloomy subject for a maths blog: let's change the scene to a school and start again! The head teacher of a school announces that there will be a fire drill at midday one day ...

## The Maths Behind Record Breaking

I came across an interesting article the other day looking at the link between record breaking and the "harmonic series" $1 + \frac{1}{2} + \frac{1}{3} + \frac{1}{4} + \frac{1}{5} + ....$. If you went through a list of 100 random numbers, have a guess as to how often would you expect to break the record for the largest number so far? Let's take a simpler example. Here are 10 random numbers: 3, 8, 5, 7, 2, 5, 3, 9, 1, 7 Clearly the first number ...

## Patterns in Pascal’s Triangle

One of the great joys in Maths is exploring something seemingly very simple and finding layers upon layers of complexity, and connections with other areas of Maths which at first sight appear to be totally separate. I'm sure you have come across Pascal's triangle; here it is: To create each new row, start and finish with 1, and then each number in between is formed by adding the two numbers immediately above. Pattern 1: One of the most obvious patterns is the ...

## Prepare Your Body and Your Mind for the Exams

This will probably be my last blog before you dive into the exams in May. I hope your revision has gone well: there's still time to go over more past papers to become as familiar as possible with the way the examiners ask questions. And don't forget that, in Maths exams, there's only one mark for the correct answer – all the other marks are for working and intermediate answers. So train yourself to write as much as you can ...

## Don’t Lose Marks Unnecessarily in Your Maths Exams

There is statistical evidence that 1 in 7 of you will lose marks which you shouldn't lose: in other words, there could be marks which you could easily gain, even if you can't answer a question, but what you put on paper didn't match the examiner's mark scheme. It's unlikely you're going to get 100%. Some questions you just can't see what to do; some you think you can do, but you get the wrong answer; or you run out of ...

## The Wine Glass and the Water Glass Puzzle

This is an old one but is a wonderful example of a puzzle with an unexpected, counter-intuitive solution. 'Two 50ml glasses are filled to the brim, one with wine and the other with water. A teaspoon (5ml) of water is transferred to the wine glass and thoroughly mixed in. Then a teaspoon of the mixture is transferred back to the water glass. Question: is there now more water in the wine, or wine in the water?' The more you think about it, ...

## Understanding Keywords in Mathematics Exams

Whether you are approaching your final exams, or you're at the stage of mid-course exams, you're probably beginning to put in some practice of past paper questions. Sometimes it isn't the maths which is hard, but understanding the language of the question; and each question will contain certain keywords which tell you how you should be tackling the question, and what you should be writing down. I can't emphasise enough how important it is to understand what, in the context ...

## Understanding the Chain Rule

Most students are first introduced to the chain rule when shown how to differentiate a function such as y = (3x - 2)5. The problem is that is tempting to try and fit all chain rule differentiations into that format, for example trying to differentiate e3x - 2 in the same way. What is the chain rule? It's a calculus formula with a wide range of uses, just one of which is differentiating a 'function of a function.' Quite simply, differentiation concerns the rate ...