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Archive for January, 2020

Never look directly at the sun, except now

January31

As a young child I can remember being told to never look directly at the sun, unless I had especially dark glasses on, such as those used for welding. This image is, therefore, more stunning when you realise that it is showing fine details across the heaving cauldron that is the sun’s surface. The darker […]

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Exam cheating doesn’t pay, unless you want to lose your career!

January30

There are many examples of students making poor choices by cheating on their test(s). For example, Many people have cheated in exams. For example, nearly 30% of university students who responded to a 2012 UK survey agreed they had “submitted work taken wholly from an internet source” as their own. In almost all cases it […]

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Going Viral with Dresses and Diseases

January30

  The coronavirus is spreading rapidly in China and is now appearing in different countries. Flights, trade and contact is being limited to the source region in Wuhan. This shocking event follows a mathematical model – one based on statistical probability. This video looks at what “going viral” means and begins with the analogy of […]

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Is Homework Pointless?

January30

I came across a thought-provoking article (source: cnn) recently that suggested that homework was a waste of good parenting time. To quote, “We are all busier than we want to be, but our neighbors have an extra, unnecessary hurdle that makes life more difficult. Next door, the kids have homework. This involves 30 minutes of child-wrangling and […]

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Do you want to be coming up with crazy new maths?

January28

Julie Love is one of the top names inside Microsoft. And what she works on is so technologically challenging, even Bill Gates has said it’s beyond his comprehension. Love runs Microsoft’s emerging quantum computing business as the group’s senior director. She was one of just five women physicists graduating in the discipline’s class of 50 […]

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Coronavirus vs SARS Graphical Error

January27

New of the fast spreading coronavirus is cause for deep concern, as well as action to contain those who have been affected. However, H3 noticed a rather erroneous graph which attempted to compare coronavirus with the SARS virus. What is wrong with this representation? (see the Post Support column for a possible answer):

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Mathematics, with a Shot of Espresso

January23

“I don’t need math ’cause I’m just going to work as a barista!” Don’t be too hasty in making a statement like this until you read this article: “An espresso is one of the most popular ways to drink coffee, but also the most complicated to make.The process depends on a delicate combination of factors […]

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Please try this at home or school

January20

Take a humble door knob and shine a strong flashlight to reveal a geometric shape. What is it?

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It’s a small world after all

January20

Size matters to mathematicians, as well as scientists (another name for mathematicians). Last year, scientists (aka mathematicians) at York University recorded the radius of a proton at 0.833 femtometres, or just under one trillionth of a millimetre. It’s enough to make your head (like your protons) spin! Incidentally, and totally unrelated, H3 visited the Music […]

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Easy Speed Multiplication

January17
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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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