## Welcome to H3 Maths

Blog Support for Growing Mathematicians

## Archive for July, 2014

### Excel basics for Math students

July29

In this series of short videos students will learn to make use of the basic mathematical features of Microsoft Excel, such as using Excel as a calculator, using functions, etc. Many high school Math students struggle to learn the basics of Excel, yet to do so can greatly enhance their skills and also provide useful […]

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### Less than excellent use of Excel…

July27

Yes, it happened to me – I was using Excel to finish my tax claim and then sent it off to my accountant. He remarked to me, over lunch, that I had made a mistake in my Excel calculations. Yes, I had made the kind of error that is just so easy to do – […]

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### Gradients of Straight Lines revisited

July23

You are probably already familiar with the concept that the gradient or slope of a straight line is how much it rises over a given horizontal length – that is, the rise divided by the run. This video clip from Waldomaths is a very good explanation of gradients, and uses several examples: The gradient of […]

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### Sound Waves and Noise Cancelling

July21

Play the note A Play the (shifted) note A You may have seen advertisements for “noise reducing” headphones. Here’s a rough idea of how they work. First they figure out what kind of noise is reaching your ears. Essentially this means it figures out the sine waves of the ambient sounds. Then it creates additional […]

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### Melbourne Student Aces Mathematical Olympiad

July17

This story has just come across the H3 desk: “A student from Melbourne, Australia, has just achieved a perfect score at the International Mathematical Olympiad in South Africa, winning a gold medal for the second year in a row. Seventeen-year-old maths genius Alex Gunning, who is in his Junior year (Year 11) at Glen Waverley […]

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### Never say “I can’t”!

July16
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### Learning Math by Doing Math…

July16

It is absolutely, 100% wrong to suggest that you simply “Can’t do math” – unless, of course, you have sustained a brain injury. Even then, the brain is a most remarkable organ that is capable of growth and change, especially in young students. Take the example of Cameron Mott, a young girl who had half […]

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### No, we are not selling you a book, but…

July16

The book title “How to Be a Math Genius” caught our attention at H3! It sure looks enticing and even the review is very positive – after all, how many 11 year olds will want to bring a Math book to read while having dinner? Reviewer Mark Frauenfelder writes, “I enjoyed learning about statistics, probability, […]

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### Really (un)impressive data!

July11

There is was, plain to see – a staggering jump in the price of gold recently (from the Kitco website), and a graph to prove it! But wait, dear mathematicians, and hang onto your investment dollars! Use your mathematical sleuth skills to check this graph out a bit more carefully. Yes, the graph does show […]

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### The Real Mathematics Stress Test

July11

Spare a thought for students presently sitting exams in Israel, where sirens and rockets have made the sitting of the Mathematics Matriculation Exams particularly harrowing recently! The Jerusalem Post reports that, “High school students throughout the country sat down on Thursday for a second opportunity testing of the mathematics matriculation exam amid the added threat […]

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#### Post Support

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)?]