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# Classic Mistake

## Classic Mistake podcasts describe the common errors made by students who are learning maths and they accompany a series of posters of the same name.

Published: Wed, 6 Aug 2008 12:25:00 +0000

Last Build Date: Wed, 6 Aug 2008 12:25:00 +0000

Classic Mistake Number 47

Wed, 6 Aug 2008 12:25:00 +0000

Classic Mistake Number 47 - Pieces of Data. Problems associated with trying to work out the mean of data from a frequency table.

Media Files:
http://www.classicmistake.co.uk/mp3/cm47.mp3

Classic Mistake Number 46

Wed, 6 Aug 2008 12:20:00 +0000

Classic Mistake Number 46 - Irrational Probability. Problems associated with trying to write down probabilities.

Media Files:
http://www.classicmistake.co.uk/mp3/cm46.mp3

Classic Mistake Number 45

Wed, 6 Aug 2008 12:15:00 +0000

Classic Mistake Number 45 - Negative times a negative. Problems associated with trying to multiply two negative numbers together.

Media Files:
http://www.classicmistake.co.uk/mp3/cm45.mp3

Classic Mistake Number 44

Wed, 6 Aug 2008 12:10:00 +0000

Classic Mistake Number 44 - A Sin of the Times. Problems associated with trying to cancel down trigonometric fractions.

Media Files:
http://www.classicmistake.co.uk/mp3/cm44.mp3

Classic Mistake Number 43

Wed, 6 Aug 2008 12:05:00 +0000

Classic Mistake Number 43 - Invisible Brackets. Problems associated with not writing in brackets when you ought to.

Media Files:
http://www.classicmistake.co.uk/mp3/cm43.mp3

Classic Mistake Number 42

Wed, 6 Aug 2008 12:00:00 +0000

Classic Mistake Number 42 - The Bottom Line. Problems associated with trying to add algebraic fractions.

Media Files:
http://www.classicmistake.co.uk/mp3/cm42.mp3

Classic Mistake Number 41

Sun, 8 Jul 2007 15:41:00 +0000

Classic Mistake Number 41 - Walk before you Fall. Problems associated with trying to do too much all at once.

Media Files:
http://www.classicmistake.co.uk/mp3/cm41.mp3

Classic Mistake Number 40

Sun, 8 Jul 2007 15:40:00 +0000

Classic Mistake Number 40 - Cancelled out. Problems associated with multiplying a fraction by a whole number.

Media Files:
http://www.classicmistake.co.uk/mp3/cm40.mp3

Classic Mistake Number 39

Sun, 8 Jul 2007 15:39:00 +0000

Classic Mistake Number 39 - An Uncalculated Move. Problems associated with not having all the equipment necessary for a maths lesson.

Media Files:
http://www.classicmistake.co.uk/mp3/cm39.mp3

Classic Mistake Number 38

Tue, 29 May 2007 15:38:00 +0000

Classic Mistake Number 38 - A = pi not squared. Problems associated with using the formula for the area of a circle.

Media Files:
http://www.classicmistake.co.uk/mp3/cm38.mp3

Classic Mistake Number 37

Tue, 29 May 2007 15:37:00 +0000

Classic Mistake Number 37 - Working Class. Problems associated with only writing down the answer to a question, with no workings shown.

Media Files:
http://www.classicmistake.co.uk/mp3/cm37.mp3

Classic Mistake Number 36

Tue, 29 May 2007 15:36:00 +0000

Classic Mistake Number 36 - Cancel Crazy. Problems associated with simplifying an algebraic fraction.

Media Files:
http://www.classicmistake.co.uk/mp3/cm36.mp3

Classic Mistake Number 35

Tue, 29 May 2007 15:35:00 +0000

Classic Mistake Number 35 - Counting Boxes. Problems associated with working out the perimeter of a shape that's been drawn on a grid of dots.

Media Files:
http://www.classicmistake.co.uk/mp3/cm35.mp3

Classic Mistake Number 34

Tue, 29 May 2007 15:34:00 +0000

Classic Mistake Number 34 - Four Lines. Problems associated with reading off the length of a line when it is on a grid of dots.

Media Files:
http://www.classicmistake.co.uk/mp3/cm34.mp3

Classic Mistake Number 33

Tue, 29 May 2007 15:33:00 +0000

Classic Mistake Number 33 - Scale it Up and Up. Problems associated with area scale factors of enlargment.

Media Files:
http://www.classicmistake.co.uk/mp3/cm33.mp3

Classic Mistake Number 32

Tue, 29 May 2007 15:32:00 +0000

Classic Mistake Number 32 - Quick Draw. Problems associated with not drawing a helpful diagram.

Media Files:
http://www.classicmistake.co.uk/mp3/cm32.mp3

Classic Mistake Number 31

Tue, 29 May 2007 15:31:00 +0000

Classic Mistake Number 31 - First Come, Last Served. Problems associated with expanding and simplifying expressions that involve subtractions and brackets.

Media Files:
http://www.classicmistake.co.uk/mp3/cm31.mp3

Classic Mistake Number 30

Tue, 29 May 2007 15:30:00 +0000

Classic Mistake Number 30 - Winner Takes All. Problems associated with negative signs outside a set of brackets.

Media Files:
http://www.classicmistake.co.uk/mp3/cm30.mp3

Classic Mistake Number 29

Wed, 11 Apr 2007 15:40:00 +0000

Classic Mistake Number 29 - Root 66. Problems associated with splitting a square root over a sum.

Media Files:
http://www.classicmistake.co.uk/mp3/cm29.mp3

Classic Mistake Number 28

Wed, 11 Apr 2007 15:35:00 +0000

Classic Mistake Number 28 - A Point Worth Noting. Problems associated with multiplying 0.5 by 0.5 and getting 2.5

Media Files:
http://www.classicmistake.co.uk/mp3/cm28.mp3

Classic Mistake Number 27

Wed, 11 Apr 2007 15:30:00 +0000

Classic Mistake Number 27 - A Square Meal. Problems associated with multiplying two single letters together.

Media Files:
http://www.classicmistake.co.uk/mp3/cm27.mp3

Classic Mistake Number 26

Tue, 3 Apr 2007 15:25:00 +0000

Classic Mistake Number 26 - Too Easy By Half. Problems associated with re-writing algebraic fractions as expressions with negative powers.

Media Files:
http://www.classicmistake.co.uk/mp3/cm26.mp3

Classic Mistake Number 25

Tue, 3 Apr 2007 15:20:00 +0000

Classic Mistake Number 25 - Done Sum Times. Problems associated with trying to simplify algebraic expressions that shouldn't be simplified!

Media Files:
http://www.classicmistake.co.uk/mp3/cm25.mp3

Classic Mistake Number 24

Tue, 3 Apr 2007 15:15:00 +0000

Classic Mistake Number 24 - Powerless. Problems associated with raising algebraic expressions that are in backets to a power that's outside the brackets.

Media Files:
http://www.classicmistake.co.uk/mp3/cm24.mp3

Classic Mistake Number 23

Tue, 3 Apr 2007 15:10:00 +0000

Classic Mistake Number 23 - Sign Language. Problems associated with squaring a negative number and how you write it down on the page.

Media Files:
http://www.classicmistake.co.uk/mp3/cm23.mp3

Classic Mistake Number 22

Tue, 3 Apr 2007 15:05:00 +0000

Classic Mistake Number 22 - 1m=100cm. Problems associated with converting from square centimetres to square metres.

Media Files:
http://www.classicmistake.co.uk/mp3/cm22.mp3

Classic Mistake Number 21

Tue, 3 Apr 2007 15:00:00 +0000

Classic Mistake Number 21 - Dire Straights. Problems associated with plotting points from a data table onto a set of axes.

Media Files:
http://www.classicmistake.co.uk/mp3/cm21.mp3

Classic Mistake Number 20

Sun, 4 Mar 2007 15:30:00 +0000

Classic Mistake Number 20 - Mind the Gap. Problems associated with drawing a well labelled set of axes.

Media Files:
http://www.classicmistake.co.uk/mp3/cm20.mp3

Classic Mistake Number 19

Sun, 4 Mar 2007 15:20:00 +0000

Classic Mistake Number 19 - Take it as it Comes. Problems to do with orders of operations.

Media Files:
http://www.classicmistake.co.uk/mp3/cm19.mp3

Classic Mistake Number 18

Sun, 4 Mar 2007 15:10:00 +0000

Classic Mistake Number 18 - Highest Common Farce. Problems associated adding two fractions.

Media Files:
http://www.classicmistake.co.uk/mp3/cm18.mp3

Classic Mistake Number 17

Sun, 4 Mar 2007 15:00:00 +0000

Classic Mistake Number 17 - Partial Expansion. Problems associated with multiplying out a bracket containing algebraic terms.

Media Files:
http://www.classicmistake.co.uk/mp3/cm17.mp3

Classic Mistake Number 16

Sun, 4 Feb 2007 15:40:00 +0000

Classic Mistake Number 16 - 2b or not 2b. Problems associated with squaring a bracket containing algebraic terms.

Media Files:
http://www.classicmistake.co.uk/mp3/cm16.mp3

Classic Mistake Number 15

Sun, 4 Feb 2007 15:30:00 +0000

Classic Mistake Number 15 - Composite Crime. The definition of a prime number and why 1 is not a prime number. Also a handy way of remembering the first three prime numbers.

Media Files:
http://www.classicmistake.co.uk/mp3/cm15.mp3

Classic Mistake Number 14

Sun, 4 Feb 2007 15:20:00 +0000

Classic Mistake Number 14 - Collection Chaos. The issues of simplying such algebraic expressions as 5a+7-2a.

Media Files:
http://www.classicmistake.co.uk/mp3/cm14.mp3

Classic Mistake Number 13

Sun, 4 Feb 2007 15:10:00 +0000

Classic Mistake Number 13 - Nothing Comes of Nothing. This issue of multiplying something by zero.

Media Files:
http://www.classicmistake.co.uk/mp3/cm13.mp3

Classic Mistake Number 12

Sun, 4 Feb 2007 15:00:00 +0000

Classic Mistake Number 12 - Double or Quits. Look 1 x 1 is not 2. It's that simple.

Media Files:
http://www.classicmistake.co.uk/mp3/cm12.mp3

Classic Mistake Number 11

Sun, 14 Jan 2007 15:00:00 +0000

Classic Mistake Number 11 - Check Mate. An insight into the mind of a teacher that's watching a student sit at the end of an exam, doing nothing.

Media Files:
http://www.classicmistake.co.uk/mp3/cm11.mp3

Classic Mistake Number 10

Tue, 9 Jan 2007 15:20:00 +0000

Classic Mistake Number 10 - 2's a Company, 3's a Crowd. An overview of what it means to raise something to a power 2 or to a power 3 - it's not the same as multiplying by 2, or multiplying by 3.

Media Files:
http://www.classicmistake.co.uk/mp3/cm10.mp3

Classic Mistake Number 9

Tue, 9 Jan 2007 15:10:00 +0000

Classic Mistake Number 9 : - x - = +. The issues and rules surrounding working out negative numbers to certain powers.

Media Files:
http://www.classicmistake.co.uk/mp3/cm09.mp3

Classic Mistake Number 8

Tue, 9 Jan 2007 15:00:00 +0000

Classic Mistake Number 8 - Overtime. Further problems arising from using decimals and time.

Media Files:
http://www.classicmistake.co.uk/mp3/cm08.mp3

Classic Mistake Number 7

Wed, 29 Nov 2006 15:00:00 +0000

Classic Mistake Number 7 - Pythagoras' Trauma. An overview of the need to pay attention to whether you are given the hypotenuse in a right angled triangle, or if you have to work it out.

Media Files:
http://www.classicmistake.co.uk/mp3/cm07.mp3

Classic Mistake Number 6

Tue, 28 Nov 2006 15:00:00 +0000

Classic Mistake Number 6 - Substandard Form. A reminder of the requirements of writing a number in Standard Form, or Scientific Notation.

Media Files:
http://www.classicmistake.co.uk/mp3/cm06.mp3

Classic Mistake Number 5

Thu, 16 Nov 2006 15:00:00 +0000

Classic Mistake Number 5 - Recurring Rounding. The issues with writing a recurring fraction as a decimal.

Media Files:
http://www.classicmistake.co.uk/mp3/cm05.mp3

Classic Mistake Number 4

Wed, 15 Nov 2006 15:00:00 +0000

Classic Mistake Number 4 - Discriminating Discriminant. One of the many problems encountered when using the quadratic formula.

Media Files:
http://www.classicmistake.co.uk/mp3/cm04.mp3

Classic Mistake Number 3

Fri, 20 Oct 2006 15:20:00 +0000

Classic Mistake Number 3 - Unequal Equals. Writing a multi-stage calculation on one single line of the page leads to confusion.

Media Files:
http://www.classicmistake.co.uk/mp3/cm03.mp3

Classic Mistake Number 2

Fri, 20 Oct 2006 15:10:00 +0000

Classic Mistake Number 2 - A mile off. Converting between decimal time and actual time. And why is it called "A mile off"? Well, consider the difference between 3.1hrs and 3h 10m in the context of athletics....

Media Files:
http://www.classicmistake.co.uk/mp3/cm02.mp3

Classic Mistake Number 1

Fri, 20 Oct 2006 15:00:00 +0000

Classic Mistake Number 1 - Standard Flop. We look at how students often incorrectly write a number in standard form.

Media Files:
http://www.classicmistake.co.uk/mp3/cm01.mp3