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Archive for July, 2015

Dice Cricket – how will your team go?

July26

There are several variations of using dice to investigate chance and statistics. In this version, which works well in Junior High, students captain a cricket team and have a total of 11 players. Each player scores runs by rolling the die and using the number rolled to equal their runs. You can keep adding up […]

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Sad Math Love Stories

July25

Source: unknown (thankfully!)

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Maths from the Monty Hall of Fame

July14

Monty Hall (left) was a game show host on “Let’s Make a Deal” who offered contestants a brand new car. All they had to do was choose the lucky door out of 3 possibilities. There was, clearly a 33.3% chance of choosing the car, right? Yes…right! However, after you chose a door, Monty Hall would, […]

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The solutions are in the manual!

July7

Some time ago, H3 picked up a repair manual used by the Army when working on vehicles that had broken down. We expected a complex, technical manual but were really surprised at the simple layout. For example, when faced with a vehicle that won’t start, there are just two possible faults – no fuel or […]

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Here’s looking at you up there!

July6

In a wonderful display of photographic expertise, this remarkable photo taken by Dylan O’Donnell in Australia, shows the International Space Station crossing in front of the moon. Click on the picture for more info. It took Dylan over a year to get this picture and he attached his camera to a telescope to effectively create […]

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Why you need Math – top 5 reasons

July3

You need to use Mathematics to do a budget and work out whether you can afford something. This is especially important when buying your first car as you need to factor in the amount of a loan, the running costs, insurance, etc. I had a friend who had bought and sold 80 cars by the […]

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Great Math Job for the Sporting Student

July1

Here is a great volunteer or work experience or Summer Intern position to get into – that of a Junior Math Match Stats Assistant. Why? You get to enjoy the game you love and you use your Mathematics to update the statistics as the game(s) progress. For example, here are some Match Stats from Wimbledon, […]

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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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