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Archive for May, 2014

Mac Mouse Magic for Mathematical Memories

May30

A few of us met the Macintosh when it was launched in 1984, and I can still remember a sample being on trial at my first school. Sitting apologetically in the corner of the main staffroom, it was a rather odd looking, all-in-one computer with a strange device attached called a “mouse”. Perhaps that is […]

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Maths and Science give better path for future earnings

May28

In a recent New Zealand study, the amount that graduates in different fields of study can expect to earn has been revealed – and the Government says it should make school students stick with science and mathematics. Yes, you read it here…Mathematics makes a BIG difference in potential future earnings! That should be great motivation […]

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Lies, Damned Lies and Statistics

May26

Mark Twain made popular the quote, “Lies, damned lies, and statistics” to describe the ability of some people to use the power of numbers to persuade others to believe their viewpoint, particularly to give statistical support for weak arguments. Take this graphic for example: “It is hard to imagine how to construct a less informative […]

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Measurement works if you have the same units!

May23

The Mars Orbiter was lost in 1999 because the Nasa team used imperial units while a contractor used metric. The $125m probe came too close to Mars during its orbit and was probably destroyed by the planet’s atmosphere. An investigation said the “root cause” of the loss was the “failed translation of English units into […]

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Math Jobs Pay Well

May21

Seen recently by H3 were these specific jobs in Mathematics, which goes to show that doing well in this subject can lead to some well paid jobs. These two are in education:

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The Geekiest Pin Numbers…

May18

as seen by SpikedMath: (Which just goes to show that there is meaning in all numbers)

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Geometry rules in Nazareth

May18

H3 noticed this striking geometric pattern in the Basilica of the Annunciation in Nazareth. This is a modern Catholic church, built over the remains of older Byzantine and Crusader churches. Supposedly the home of Mary, this popular tourist attraction has many mathematical elements in both its (largely concrete) construction and interior and exterior design.

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Constructing a Parallelogram

May13

This excellent visual guide shows you how to construct a Parallelogram – a shape with two opposite pairs of parallel sides. I remember a friend of my father who, when giving marching orders to his army group, said, “Keep those arms paralysed to the ground!” Of course, he meant “…parallel to the ground” but I […]

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German Soccer shootouts are mathematically better

May9

In an interesting article by DW on soccer and math, an analysis was done of penalty shootouts in the European Soccer league. Research showed that most shooters have a 75 percent chance of scoring. But according to binomial probability, and common preconceptions, the Germans do much better. For a world class soccer player, scoring a […]

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Iditarod Math Activities

May9

The great Iditarod race across the wilds of Alaska is a superb window into the mathematics of distance, endurance, supplies and time – all based on man (or woman) vs wild. This video clip gives some insight: For students and teachers, the Iditarod Math Portal has a host of great activities based around this annual […]

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« Older Entries

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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