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Posts tagged with counting

Zero Has a New Hero

November16

London (2017): An ancient Indian manuscript, dating back to the third century, has revealed the oldest recorded use of ‘zero’ – pushing back one of the greatest breakthroughs in the history of mathematics back by over 500 years, Oxford scientists say. Bakhshali manuscript was found in 1881, buried in a field in what was then […]

And a bit of fun for a change …

February20

How many spare parking spaces are in this picture?see Post Support for answer

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Something without brains can ‘count’ to five!

January22

Venus flytraps and other carnivorous plants have the ability to count, according to a new study. The discovery adds to the growing body of evidence that certain plants possess many animal-like abilities, even though they do not have brains. In this case, it is now known that meat-eating plants can count to at least five. […]

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Words began with numbers!

October2

“Much like today’s tablets, writing at length on the world’s first tablets was a pain in the neck. Fire-hardened clay tablets were really only convenient for scribbles and straight lines, just enough for simple accounting with graphic symbols and tick marks. “Words, in a sense, began with numbers” says Peter Watson in his superb book […]

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Counting…Egyptian Style

December6

The early Egyptian records, from around 1800 BC, show a decimal system where objects represent the powers of ten (1,10,100, etc.). In this pictorial system there was no sign for zero or for decimals. Here is an example: and how it was used… Article source and more information on this remarkable mathematical culture here

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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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