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Archive for March, 2013

Pi Day, Oz Style

March14

Yes, we were ahead of our lagging mathematicians in other classrooms today – with an early Pi DAY. March 14 (3.14) is a day ahead of our American counterparts and staff were delighted to receive small jam and lemon tarts to celebrate this auspicious day in the Mathematics calendar! Would love to see photos from […]

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Enlargement (or Dilation) with a great app

March11

There is a good app from waldomaths (Java required) to see what happens when we have scale factors that are positive, zero and negative. For example, what would the image of a shape look like if it is enlarged by a scale factor of -3 rather than +3 ??               […]

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Scale – the Mathematics of Supersizing without Fries

March11

In this picture it seems that the golf ball is enlarged too much for our budding maths student!! There are two ways to look at scale – one is that similar objects (that is, objects which have corresponding angles the same) also have their corresponding sides in the same ratio. For example, say we have […]

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Mathematics and the art of string theory

March9

The artist Louisa Bufardeci has long been fascinated by the rich resources of scientific theory. String theory is an area of Physics that aims to describe all the parts of the universe, and how they behave, in one master mathematical equation. It has led physicists to suggest that the smallest element of matter, from which […]

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Open, Interactive Mathematics for all

March7

IMAGINARY is your place for open and interactive mathematics. You can explore great programs, enjoy beautiful picture galleries and create hands-on math exhibits. Share your own ideas and modules. Stage your own exhibitions. This is an exciting Mathematical concept as part of the Mathematics Planet Earth 2013 initiative. More than 180,000 have visited IMAGINARY, including 900 school classes. […]

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Lotto winner is half mad…

March6

This was reported in a recent newspaper report, when the Lotto winner was asked what he would do with his winnings. He replied, “I would bank half, invest half, and then spend the rest on my family – helping them out with mortgages and assets. I’d probably treat myself by paying off my own mortgage.”

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Algebra – Xposed!

March4

“In algebra, x can be anything: 12, -47, a billion—the sky’s the limit. And by the time you finish this book, you’ll be a master at solving for x and a ton of other algebra topics. But can you imagine if when we solved for x, we started by stereotyping it, shutting out a whole […]

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Pi Day is getting closer!

March3

Yes, we are again (see the last Pi Post) heading towards Pi Day (March 14 or 3/14 in the USA). Of course, in Australia and New Zealand we are able to celebrate a day earlier (on 14/03) than our North American mathematicians! We wonder whether Google will produce a unique Pi Day logo?

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Tradition for Addition…

March2

Yes, dear young mathematician, you need to heed Dr Vaughan Jones. He is a Fields Medal winner (like winning a Nobel Peace prize) in Mathematics. He is also a very practical person who has an interest in seeing young people succeed in their math. This article reinforces the need to learn the basics and learn […]

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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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