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Archive for April, 2012

Hold on to your flux capacitor – we are going back to the future!

April29

Great Scott. Hold on to your DeLoreans! Can we really go “Back to the Future”? Well, yes and…no! As Marty McFly and Doc Brown (below) found out – the past and future can be pretty scary places! Read the script draft here! Time is the great 4th dimension that we would love to be able to […]

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Measuring Changes in Nature

April29

Measurement in Mathematics is a great topic. Look at this amazing picture and the text that goes with it; But how do we know that the bike was left tied to the tree in 1914? From the story of course! However, we can check the story out by using a special drill that takes a […]

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Naplan for Australian Students

April28

Yes, not long until the Naplan testing on May 15-17. There is more information on this earlier blog. For students from other countries you might like to try your skills on the numeracy papers. Click here for sample test papers, along with answers. Remember that this testing is not content specific but tests a range of mathematical skills […]

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World’s narrowest house?

April27

How wide is the house or apartment you live in? 10 or 15 metres or more? How would you cope with a house that’s only 1.33 metres at its widest point? Etgar Keret’s House in Warsaw is being built in the tiny gap between 2 buildings. It’s intended as an art installation that will also serve as […]

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How many Cells?

April27

We have about 75 to 100 trillion (100,000,000,000,000) cells and some 100,000,000,000 (100 billion) cells in our brain. There should be enough free to do some Mathematics?? Never could do Maths? Don’t worry, every 7 years your cells renew themselves, so you can give Maths another go then!

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Brain Freeze can slow Maths responses!

April27

Stanford researchers studying math anxiety in second- and third-grade students found that kids who were stressed about math had brain activity patterns similar to people with other phobias. When the children were faced with a simple addition problem, the parts of their brain that feel stress lit up – and the parts that are good […]

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Infinite possibilities with Infinity

April26

Here is a rather philosophical summary of the concept of Infinity:

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Can a sports car drive upside down?

April25

Car aerodynamics. Take at look at this latest release from Lamborghini: Perhaps a simpler way to look at this area of practical mathematics is to take just one simply aspect of car design – the spoiler. Check out this excellent mathspig site which considers the forces at work in a Formula 1 design:

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GeoEye – new perspectives for Measurement in Maths

April24

GeoEye provides amazing satellite images and these can be searched for exercises in measurement and scale, etc. For example, calculate the perimeter of the outer road of State Circle in Canberra, Australia:

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Lewis Carroll – Alice in a Wonderland of mathematical (n0ne)sense

April23

Oh how much we enjoy the quirky logical (or illogical?) lines in Alice in Wonderland. For example; Lewis Carroll was the pen name for Charles Dodgson. Charles was Born on January 27, 1832 in Cheshire, England, and he wrote and created games as a child. At age 20 he received a studentship at Christ Church […]

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Post Support

Largest number between o and 1 million which does not contain the ‘n’ is 88

 

Rotation SAT Problem: Answer: 4 (see: https://www.youtube.com/watch?v=FUHkTs-Ipfg)

 

Which number has its letters in alphabetical order? Answer: F O R T Y

Hidden Rabbit? Clue: check the trees

How long for the stadium to fill? 45 minutes.

Where are you? the North Pole

Prize Object Puzzle: If Sue does not know where the prize is in the first question, it can’t be under the square. She must have been told it is under another shape. Apply this same logic to Colin. It is then obvious that the prize cannot be under a yellow object. That helps Sue eliminate her yellow shapes. Got the idea?

Algebra Puzzle: Answer = 1

Popular Math Problems Answers: 1, 1

Number of tabs? According to Lifehacker, the ideal number of tabs you should have open is nine. Yes, a single digit. To some, this is like playing a piano and only using a fraction of the notes!

Worst Graph? Where to start. What a visual mess and even some of the lines merge and are impossible to follow. A graph is a visual display of data, with the goal to identify trends or patterns. This is a spider’s web of information which fails to show a clear pattern at all. Solution? Well, different colors would help, or why not group in two or three graphs where trends are similar?

Number of different nets to make a cube is eleven – see this link

Homework Puzzle; The total value of the counters is 486, so halve this to get 243. Now, arrange the counters to equal this amount twice.

The graph on the left (Coronavirus) is for a time period of 30 days, while the one on the right (SARS) is for 8 months! Very poor graphical comparison and hardly relevant, unless it is attempting to downplay the seriousness of the coronavirus?

10 x 9 x 8 + (7 + 6) x 5 x 4 x (3 + 2) x 1 = 2020

NCEA Level 2 Algebra Problem. Using the information given, the shaded area = 9, that is:
y(y-8) = 9 –> y.y – 8y – 9 =0
–> (y-9)(y+1) = 0, therefore y = 9 (can’t have a distance of – 1 for the other solution for y)
Using the top and bottom of the rectangle,
x = (y-8)(y+2) = (9-8)(9+2) = 11
but, the left side = (x-4) = 11-4 = 7, but rhs = y+? = 9+?, which is greater than the value of the opp. side??
[I think that the left had side was a mistake and should have read (x+4)?]

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