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Murderous Maths

Murderous Maths is a series of British educational books by author Kjartan Poskitt. Most of the books in the series are illustrated by illustrator and author Philip Reeve, with the exception of "The 5ecret L1fe of Code5", which is illustrated by Ian Baker, and "The Murderous Maths of Everything", which was illustrated by Rob Davis. The Murderous Maths books have been published in over 25 countries. The books, which are aimed at children aged 8 and above, teach maths, spanning from basic arithmetic to relatively complex concepts such as the quadratic formula. The books are written in an informal similar style to the Horrible Histories, Horrible Science and Horrible Geography series, involving evil geniuses, gangsters, love stories and smelly burgers. The author also maintains a website for the series, which has has been running for the past 10 years[http://www.murderousmaths.co.uk/].


The first two books of the series were originally part of the "The Knowledge" (now "Totally") series([http://www.kjartan.co.uk/books/books.htm]), itself a spinoff of Horrible Histories. However these books were eventually redesigned and they, as well as the rest of the titles in the series, now use the Murderous Maths banner. According to Poskitt, "these books have even found their way into schools and proved to be a boost to GCSE studies". The books are also available in foreign editions including: German, Spanish, Polish, Greek, Dutch, Norwegian, Turkish, Croatian, Italian, Lithuanian, Korean, Danish, Portugese, Hungarian, Finnish, Thai and Portuguese (Latin America) [http://www.murderousmaths.co.uk/books/books.htm]. In 2009, the books were redesigned again, changing the cover art style and the titles of most of the books in the series.

Poskitt's goal, according to the Murderous Maths website, is to write books that are "something funny to read", have "good amusing illustrations", include "tricks", and "explaining the maths involved as clearly as possible". He adds that although he doens't "work to any government imposed curriculum or any key stage achievement levels", he has "been delighted to receive many messages of support and thanks from parents and teachers in the UK, the USA and elsewhere".


The following are the books that are currently available in the series.

  • Guaranteed to Bend Your Brain (previously Murderous Maths), ISBN 0-439-01156-6' - (+ - x / %, powers, tessellation, roman numerals, the development of the "10" and the place system, shortcomings of calculators, prime numbers, time - how the year and day got divided, digital/analogue clocks, angles, introduction to real Mathematicians, magic squares, mental arithmetic, card trick with algebra explanation, rounding and symmetry.)
  • Guaranteed to Mash your Mind (previously More Murderous Maths), ISBN 0-439-01153-1' (the domino and pentomino, length area and volume, dimensions, measuring areas and volumes, basic rectangle/triangle formulas, speed, coversion of units, mobius strip, pythagoras, right angled triangles, irrational numbers, pi, area and perimeter, bisecting angles, triangular numbers, topology networks, magic squares.)
  • Awesome Arithmetricks (previously The Essential Arithmetricks: How to + - × ÷), ISBN 0-439-01157-4' - (odd even and negative numbers, signs of maths, place value and rounding off, manipulating equations, + - x / %, long division, tames tables, estimation.)
  • The Mean & Vulgar Bits (previously The Mean & Vulgar Bits: Fractions and Averages, ISBN 0-439-01270-8 (fractions, converting improper and mixed fractions, adding subtracting multiplying and dividing fractions, primes and prime factors, reducing fractions,highest common factor and lowest common denominators, Egyptian fractions, comparing fractions, converting fractions to decimals, decimal place system, percentages: increase and decrease, averages: mean mode and median.)
  • Desperate Measures (previously Desperate Measures: Length, Area and Volume, ISBN 0-439-01370-4' (measuring lines: units and accuracy, old measuring systems, the development of metric, the SI system and powers of ten, shapes, measuring areas and area formulas, weight, angles, measuring volume, Archimedes Principle, density, time and how the modern calendar developed.)
  • Do You Feel Lucky? (previously Do You Feel Lucky: The Secrets ofProbability, ISBN 0-439-99607-4' (chance, tree diagrams, mutually exclusive and independent chances, Pascal's Triangle, permutations and combinations, sampling.)
  • SavageShapes(previously Vicious Circles and Other Savage Shapes, ISBN 0-439-99747-X' (signs in geometric diagrams, Loci, constructions: perpendicular bisectors; dropping perpendiculars; bisecting angles, triangles: similar; congruent; equal areas, polygons: regular; irregular; angle sizes and construction, tessellations and Penrose Tiles, origami, circles: chord; tangent; angle theorems, regular solids, Euler's formula, ellipses, Geometric proof of Pythagoras' Theorem.)
  • The Key To The Universe (previouslyNumbers: The Key To The Universe, ISBN 0-439-98116-6' (Fibonacci Series, Golden Ratio, properties of Square, Triangle, Cube, Centred Hexagon and Tetrahedral numbers, "difference of two squares", number superstitions, prime numbers, Mersenne primes, tests to see if a number will divide by anything from 2-13 and 19, finger multiplication, binary and base 8, perfect numbers, irrational transcendental and imaginary numbers, infinity.)
  • 'The Phantom X (previously The Phantom X:Algebra, ISBN 0-439-97729-0' (variables, elementary algebra, brackets, factorising, expanding, and simplifying expressions, solving quadratics and the quadratic formula, "Think of a number" tricks, difference of two squares, coefficients of (a-b)n, linear graphs: co-ordinates; gradients; y intercept, non-linear function graphs including parabolas, simultaneous equations: substitution and elimination, dividing by zero!.)
  • The Fiendish Angletron (previously The Fiendish Angletron:Trigonometry), ISBN 0-439-96859-3' (scales and ratios in maps and diagrams, protractor and compass, SIN, COS and TAN ratios in right angled triangl

From Yahoo Answers

Question:I made a mistake while trying to assemble a book shelf and now I need to separate 2 pieces of wood that I have glued together. Do you know how I can do that?

Answers:Chances are you can't and you'd damage the wood at the joint. most glues penetrate the wood grain and are stronger than the wood. Best idea would be to saw close to the joint, ideally through it, then decide wether to replace the bit of wood or glue it back up. Next time assemble it dry before gluing to make sure it's ok. Hopefully your mistake won't cost you more than a missing shelf. Sorry if this answer wasn't ultimately more helpful.

Question:Each binary digit is termed a bit. A series of 8 bits is grouped together into a word, which is called a byte. A byte can represent 28 = 256 different combinations, which is sufficient to record a typical 8-letter word in a sentence. A typical 400 page book has about 2 x 105 words. Estimate the number of books that can be stored on a 1.35 gigabyte computer.

Answers:28 does not = 256. 2^8 does. But storing 8 letters in one byte is not resonable unless you are using a compression scheme. Typically, uncompressed text is one byte per letter or character, in ASCII. A two letter word, not counting capitals, could be one of 26 times 26 possible combinations, which is much more than 16 times 16 = 256. 2 x 105 = 210, which is only half a word per page. 2^105 is more likely. Also, 1 gigabyte can be 1 times 10^9 = (1000) ^3 bytes if you talk to a hard drive manufacturer, or it can be 2^30 = ( 1024 ) ^ 3 as Windows displays it. regardless, divide 1.35 x 10^9 bytes by 2^105 words per book, to get the number of "byte books per word." Then divide by the number of "bytes per word" to get the number of books.

Question:Solve the following 2 problems: 1. Solve for x: (3)(sqrt2x) -10 = 0 << I got x =8 >> 2. Solve for the negative value of x: (x - 3) ( x - 2) = (x + 5) (2x - 3) + 21 << Is it -1/500 (-0.002) ?? >> Find the product of your answers. Raise this product to the power of the absolute value of the sum of your answers. << I don't understand this part at all!! >> I need that final answer mostly! If you can explain how you got it great, but if not just the answer is fine so that I can use it to get to the last Box #9! Here is the website to the actual problem, it is easier for you to understand there: http://mathbits.com/Caching/A16807.html I've been working on this for many hours so any help is much appreciated!!!!!!!

Answers:Solve the following 2 problems: 1. Solve for x: (3)(sqrt2x) -10 = 0 << I got x =8 >> This is correct. 2. Solve for the negative value of x: (x - 3) ( x - 2) = (x + 5) (2x - 3) + 21 << Is it -1/500 (-0.002) ?? >> This is however wrong. The answer should be x = 0 or -12 when you solve the quadratic equation. Since the negative value is required, x=-12. For this part... Find the product of your answers. Raise this product to the power of the absolute value of the sum of your answers. To find the product, take 8 mutiply by -12 and you get -96. The absolute value of the sum of your answers is calculated you take -12 + 8 which gives -4 and taking absolute will give 4. So taking -96 to the power of 4 gives you 84934656. I tried it and it works! =) I hope it helped. Good luck!

Question:I have a really tough question on my homework, any help is appreciated. What could I do to mathematically prove that the area of any sector of a circle with central angle '@' is A=1/2@r^2 (@ is the measure of the center angle in radians, r is radius, 1/2 is one half). It's a basic formula, but I can't think of any way other than example, and that won't work. Someone better at math, any suggestions?

Answers:If this a homework problem, for SURE the teacher expects you to figure it in this way: The area A of a full circle of radius r is: A = r A sector angle of is a fraction of the full circle of 2 . This fraction is / 2 The area S of the sector with central angle is that fraction of the full circle, or S = ( / 2 ) A = ( / 2 ) ( r ) = ( / 2) r Keep in mind that 360 degrees in radians is 2 . That's it. Addendum: Read the guy's answer below if you're taking a calculus class.