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Archive for December, 2012

Fractals and other top pictures from 2012

December31
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The Mathematics of Christmas

December29

It does seem strange to be sweltering here in summer heat and wanting to have a swim at the beach, while our Northern Hemisphere friends are fighting off cold, winter blasts, and snow. I really enjoyed this blog entry on the Wondrous Mathematics of Winter: “There’s the snowman: the human form given in three spheres. […]

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Formula for a Perfect Holiday

December25

What’s the formula for the perfect holiday? I’d have thought it depends very much on what sort of person you are. But a mathematician, a psychologist and travel experts from online travel agency Expedia.co.nz, reckon they’ve got it sussed for all of us. Based on research from 1000 Australians and 500 New Zealanders about their […]

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How does Santa visit all those homes?

December24

                  In The Mathematics of Christmas Keith Devlin notes that, “…by traveling east to west, Santa can take advantage of the different time zones, and that gives him 24 hours. Santa can complete the job if he averages 1250 household visits per second. In other words, for […]

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MoMath Opens in New York

December24

Mathematics illuminates the patterns and structures all around us. The dynamic exhibits and programs at the new MoMath Museum stimulate inquiry, spark curiosity, and reveal the wonders of mathematics. The Museum is located at 11 East 26th Street in Manhattan and is open from 10:00 AM to 5:00 PM, seven days a week.

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125th Anniversary of Srinivasa Ramanujan Celebrated

December24

              Coinciding with the 125th birth anniversary of mathematics genius Srinivasa Ramanujan, a math lab was inaugurated at Sri Chaitanya International Olympiad School at Gayathri Nagar on Saturday. Read the full article here.

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Why do some students find Math difficult?

December23

“It’s not yours to reason why, just learn to multiply”. Too often, as students (or even as adults) we simply do our Mathematics by learning a rule, rather than finding out why a certain rule works! Then, when we forget the rule, we give up. That is not good Mathematics (unless we have a great […]

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10 Biggest Math Mistakes in History

December22

Check out these 10 big math errors from the pages of history. Many are so simple that students are trained to avoid them in class!  

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Factorials

December20

The factorial of a number is the product of all the whole numbers, except zero, that are less than or equal to that number. For example, to find the factorial of 7 you would multiply together all the whole numbers, except zero, that are less than or equal to 7. Like this: 7 x 6 x 5 x 4 […]

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6=3+2+1

December19

Funny how we can see numbers all around us…

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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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