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Archive for July, 2020

They knew I was a crazy mathematician and had no sense of reality

July29

“They knew I was a crazy mathematician and had no sense of reality.” Dr. Richard W Hamming For many years, Bell Labs ran an internal speaker series known as the Bell Communications Research Colloquia Series. This particular talk, given by Dr. Richard W Hamming in 1986, was focused on answering one question: “Why do so […]

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Great Starter Activities for Students

July25

Transum.org contains over a thousand free mathematical activities for teachers and pupils. These jigsaw-type puzzles (Tangrams, are great starter activities, or a fun activity for students who finish their work early. Here is an interesting comment on Tangrams from Henry Ernest Dudeney (an English author and mathematician who specialised in logic puzzles and mathematical games. He was known […]

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Measurement 101

July21

Mathematics prides itself on accuracy, even when estimating values. Think what would happen if two builders were using the following tape measures on the same job! There would be uneven walls, or mismatched joins. This picture also raises the importance of quality control and many products today seem to lack good quality. Manufacturers rely upon […]

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A 13yr old Girl Uses Math to Help Win The Battle of Britain

July16

A follow up video that gives some idea of the practical outcome of Hazel Hill’s work can be found here.

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Great Cryptography Mystery at the Home of Secrets

July15
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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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