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Archive for January, 2013

Thanks for supporting H3

January17

Thanks for supporting H3 Maths. With 3000+ visitors in less than a year it has been a humbling journey – one where we are trying to stimulate a practical, real world interest in things mathematical. Not all of these 3000 are unique but it still amazes how many different countries are represented, across diverse cultural […]

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Making nonsense…

January16

In Mathematics, we can make nonsense, such as dividing a number by 0. Here is (almost) the English equivalent:  Source here

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The Math Numbers favour Women

January15

On Monday, May 3, 1999, 212 high school women and 36 of their teachers from 27 high schools in the greater New York area met at St. John’s University to participate in its eighth annual Sonia Kovalevsky Day. The schools ranged from public to private and from inner city to suburban. The Dean of St. […]

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Mind-Boggling Math Fact #3

January15

Weirdly, random data isn’t actually all that random. In a given list of numbers representing anything from stock prices to city populations to the heights of buildings to the lengths of rivers, about 30 percent of the numbers will begin with the digit 1. Less of them will begin with 2, even less with 3, and so […]

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Mind-Boggling Math Fact #4

January13

Prime Spirals: Because prime numbers are indivisible (except by 1 and themselves), and because all other numbers can be written as multiples of them, they are often regarded as the “atoms” of the math world. Despite their importance, the distribution of prime numbers among the integers is still a mystery. There is no pattern dictating which […]

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Mind-Boggling Math Fact #5

January9

In the important mathematical field of topology, two objects are considered to be equivalent, or “homeomorphic,” if one can be morphed into the other by simply twisting and stretching its surface; they are different if you have to cut or crease the surface of one to reshape it into the form of the other. Consider, for example, […]

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Understanding Traffic Flows with Mathematics

January6

Mathematicians from the University of Exeter have solved the mystery of traffic jams by developing a model to show how major delays occur on our roads, with no apparent cause. Many traffic jams leave drivers baffled as they finally reach the end of a tail-back to find no visible cause for their delay. Now, a […]

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Brushing up your Order of Operations skills

January3

Comment, giving your solution!

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Forensics and Mathematics – a good detective novel

January2

Do you enjoy a good detective book or movie? Yes, forensics appeals to our growing mathematicians just as much as it does to TV, film and book audiences. There are many great websites that look at the role of Mathematics in solving detective cases. Check out the powerpoint detective case by clicking on the above […]

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Welcome to 2013

January1

The world is finally entering a new year – 2013 (but, of course, you already knew that). What you may not know is that January 1st, 2013 is also the 30th anniversary of the Internet. Yes, techno-mathematicians, the WWW as we know it had humble beginnings. January 1st, 1983 (also know as “Flag Day“) was […]

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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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