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Posts tagged with numbers

Thinking about numbers…

May27

Can you find the pattern? (see Post Support if you need help)

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Turning 10

December19

A significant milestone in the life of our young granddaughter – turning 10. Double digits. Almost a teenager – perhaps could be called a “ten-ager”? (from Wikipedia: “Ten is the base of the decimal system, by far the most common system of  numbers in both spoken and written language. We assume that ten is the […]

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Don’t be fooled by the Cowanumba!

September7

This (almost) mathematically puzzling picture shows an ordinary cow with two ear tags. Of course, you might be drawn to the number 7354 itself and be trying to work out its factors (you were trying to do that weren’t you?). Yes, there are two tags and the number 2 is one of the prime factors […]

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Counting less than 4 comes naturally!

August31

“Salamanders, given a choice between tubes containing two fruitflies or three, lunge at the tube of three1. This hints that the ability to differentiate between small numbers of objects may have evolved much earlier than scientists had thought. Primates can spot the greater of two quantities smaller than four, without any training. Babies choose the […]

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Comfort in Numbers

July6

Melissa Browne is an accountant, adviser, author and shoe addict. She finds great comfort in numbers. Melissa says, “I believe there is great comfort in numbers. Let me explain with some examples: A young couple want to buy a home or apartment and want to save for a deposit, but don’t know how much they […]

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The Magic of Numbers

June13

It is not known who created this magic square, but it is shown in Durer’s famous 1514 engraving, known as Melancholia. What is quite remarkable about this square is that: 1. All the rows, columns and the two diagonals add up to the same number, just like ordinary magic squares. In this case the number […]

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The Geekiest Pin Numbers…

May18

as seen by SpikedMath: (Which just goes to show that there is meaning in all numbers)

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What’s Your Lucky Number?

March1

This installation of 99 animals drinking at a pool is part of the exhibition in Brisbane by Chinese contemporary artist Cai Guo-Qiang. There are 99 animals – an important number in Chinese culture. “No. 9 in Chinese culture means longevity and eternality. Thus, there were 9,999 rooms within the Forbidden City in Beijing. It is […]

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Doodling leads to math discoveries

January28

Click on the Fibonacci tag below for more information on this great math subject.

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Working with everyday numbers

December9

OK. Here is a sign at a bus stop in Singapore. Can you work out the different types of numbers – any primes; any squared numbers, odds and evens, etc.? It still amazes H3 how many students use numbers like these each day, but never actually study them. The mental gymnastics of number analysis is […]

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Post Support

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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