Wednesday, October 9, 2019 0

Over the past few years I have written blogs for IB students on a wide range of mathematics-related topics. Some of these blogs have covered specific areas of syllabus content where I know students can have difficulties. With many of you either at the start of your diploma course, of halfway through, this seems like a good moment to help you find them. Quadratic factorisation can cause some head-scratching, although if you are following the new Applications and Interpretation course you ...

Friday, April 26, 2019 0

Why should it? Well, try this: 5 ÷ 10 = 0.55 ÷ 1 = 55 ÷ 0.1 = 505 ÷ 0.01 = 5005 ÷ 0.001 = 5000 As we divide by smaller and smaller numbers the result gets ever bigger. Logically, then, as the divisor tends to (ie gets closer to) zero, so the result tends to infinity. But this is not the same as saying that division by zero actually is infinity, is it? What about drawing a graph with ...

Monday, March 25, 2019 0

Last month I made some suggestions for a revision plan. Now, having decided you're going to spend a 3 hour session revising Maths, how should you set about it? Since the only thing you will be asked to do in the exam is answer Maths questions, then surely the best way to revise is ... do lots of past paper questions! And you need to have the answers, or the mark scheme, to hand. But it's what you learn from answering ...

Friday, March 1, 2019 0

I don't want to be too prescriptive about how you should revise – everyone's different, everyone remembers stuff in different ways – but you should definitely prepare a revision plan. If you don't, then it will be a matter of luck whether or not you'll be ready in time for the exams. Most of you will have at least some holiday time before the exams, and it's imperative you make the most of it – you're on your own, and it's ...

Friday, February 15, 2019 0

Card tricks fall into several categories, and my favourite are those which look amazing but actually have some pretty simple maths behind them. Here's one of the simplest! 1.     Take an ordinary pack of cards and shuffle it. Deal out 26 cards, face up, and remember the 7th card. 2.    When you've dealt out the 26 cards, pick up the pile and turn them face down on the table, to one side. (If you're brave, shuffle them first, but make ...

Wednesday, January 9, 2019 0

Babylon – in ancient Mesopotamia, now Iraq – hosted one of the earliest recorded civilisations. Partly because they became a trading nation, they developed some of the earliest mathematical techniques. We already know that they were aware of what we now call Pythagoras' Theorem (in a numeric sense, since algebra didn't exist), but the some of the secrets of a tablet known as Plimpton 322 have been unravelled to show that they had developed a highly sophisticated form of trigonometry, ...

Friday, December 14, 2018 0

In statistics, a population is the complete set of data which is to be analysed. A population may consist of people (e.g. those living in a particular city), or living things (e.g. the population of all humpback whales), but could be any set of objects with something in common (e.g. all cars travelling on a particular road in a 24 hour period). Usually, it isn't possible to analyse a complete population. Why? It would take too long It would be too ...

Friday, November 16, 2018 0

Sam Lloyd was born in Philadelphia in 1841, but lived most of his life in New York. He was primarily a chess player and composer of chess problems, but he also delighted in mathematical puzzling. Actually, not just mathematical puzzles, but word puzzles; picture puzzles; tangrams; he composed thousands of them. In fact, it was one of his pictorial puzzles which grabbed my attention at a very early age, and possibly sparked my enjoyment of such puzzles. Have a look ...

Monday, October 22, 2018 0

Whether you are in the first weeks of your diploma course, or whether you are halfway through, there are always going to be some parts of the maths syllabus that make you scratch your head! Over the past couple of years some of the blogs I have written have concentrated on specific topics which I know can benefit from further explanation. I thought it would be helpful to list those blogs here: a reference for those that are new to ...

Friday, September 21, 2018 0

Do people still play pencil and paper games these days? I grew up with them in my family – all sorts from number games, word games, drawing games. A number of the mathematical games involve spots or dots and, believe me, they can be fiendishly difficult to win against a good opponent. The simplest of all is boxes. A square grid of dots is created (the bigger you make it, the longer the game). The first player joins two  adjacent dots with either ...