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Archive for February, 2012

Relationships – the facebook of numbers

February22

Yes, it’s true – numbers behave much like people. For example, one group of numbers is even and another group odd (you may recognise the odd ones at a party); other numbers are very much alone – we call these the Prime Numbers (more on them in another blog). The Prime Numbers are the ones […]

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Every 7 Seconds – You do the Math

February22

The news this morning is that Adele has sold an album every 7 seconds for the last year. How many albums did she sell (clue on this page)?  

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Some Cool Maths Numbers to Learn

February21

Yes, time to brush up on those numbers again. Here are some cubes that are worth learning. They seem to come up during maths courses on a regular basis: 1 x 1 x 1 = 1 (of course. 1 is the 1dentity element for multiplication, so it keeps numbers the same) 2 x 2 x […]

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Statistics again – This Month in Numbers

February21

Wow a big word – Statistics. Think about this as a way of measuring how data behaves. Statistics really started when mathematicians were working out if it was possible to win (and how often) when playing card games, etc. Nowadays, statistics are used in all areas of government and commerce. Here are some interesting recent […]

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300 – Yes, Three Hundred, etc.

February17

Yes, dear Mathematics Bloggers – we have reached 300 on this site since early January. I am not sure what that really means but the number 300 does get me thinking about milestone numbers. For example, did you notice that there have been lots of posts recently about San Francisco and guess what? Yesterday in […]

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Do we live in the 11th dimension?

February16

Perhaps! As we consider the number of dimensions that exist we need to explore the properties outside our normal spacetime experience and look at the structure of the universe. In fact, Astronomy and Mathematics are close cousins. Click on the magazine to find out one suggested answer to the question in this post.

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Definition of Infinity

February16

Perhaps one of the best definitions of infinity was made by a Year 9 student who said that, “Infinity is the place where things happen that don’t”

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Do Parallel Lines Ever Meet?

February16

The idea that parallel lines might meet has a lot to do with infinity. For example, when you look along railway tracks they seem to meet at a point in the distance. Also, on the earth, lines of longitude seem to be parallel yet they meet at the poles. These anomalies are to do with […]

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Another Parallel Pic

February15

We encounter parallel lines and symmetry all around us. This pic was taken in China and has strong repetitive patterns and parallels. Check out this interactive site to learn about three rules with angles and parallel lines.

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Caught Napping in the 2nd Dimension in a Parallel Universe

February15
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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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