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Archive for May, 2017

DESMOS – Your new best graphing friend!

May26

Desmos is a great online graphing tool and ideal for teaching and learning at all levels. It is intuitive and really versitile and highly recommended by H3 Maths as “Your new best graphing friend.” Give it a go!

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Mathematically, the Time Machine is possible!

May26

Physicists have come up with what they claim is a mathematical model of a theoretical “time machine” – a box that can move backwards and forwards through time and space. The trick, they say, is to use the curvature of space-time in the Universe to bend time into a circle for hypothetical passengers sitting in […]

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Another puzzle moment

May23

This puzzle is divided into quarters. Each quarter uses two missing numbers plus the 3 in the center to add to the number in the middle. For example, add the missing numbers at 12 o’clock, 3 o’clock and the 3 to = 10. There are several combinations and this puzzle first appeared as a Year […]

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Join the line of Mathematicians…

May23
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Career Clues from Bill Gates

May17

Microsoft co-founder Bill Gates said he is often asked for career advice by young graduates. Mr Gates summarised his advice in a series of tweets and shared what he would study if he were starting his career in 2017. “AI [artificial intelligence], energy and biosciences are promising fields where you can make a huge difference,” […]

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Fly away with Math in your Career!

May7

Different careers make use of different Mathematics skills. Check out the excellent summary, as well as some other great resources, at WeUseMath.org

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Apple can buy the whole orchard!

May4

This week Apple announced that its cash holdings have surged to $US256.8 billion. That’s whole lot of folding stuff and is really difficult for any student grasp, especially if they are not getting much pocket money! So, it raises the question – what could Apple buy with all that spare change? Here are some examples […]

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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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