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Introduction to Percents

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by

Greg Reed

on 27 September 2010

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Transcript of Introduction to Percents

Why are Percents Important?
What is a Percent?
"per cent" means "per hundred"
"Percent" is from the Latin adverbial phrase per centum meaning “by the hundred.” The Latin phrase entered English in the 16th century. Later, it was abbreviated per cent. with a final period. Eventually, the period was dropped and the two parts merged to produce the modern one-word form "percent". (Dictionary.com)
The symbol evolved from a symbol similar except for a horizontal line instead of diagonal (c. 1650), which in turn evolved from an abbreviation of "P cento" (c. 1425, from the Italian per cento "for a hundred"). (Wikipedia.com)
"%" in the 15th century, an abbreviation of per cento
This tile is cut into 100 blocks.
Here, we see all 100 of
the 1oo pieces.
Now, let's look at
just one of the 100 blocks.
If we consider one of the 100 blocks...
...we see that it is
one block out of
the original 100 blocks.
So, our one block is
one out of 100, or
one block per 100 blocks.
And remember...
That means our one block
out of 100 represents 1/100 of
the original tile, or...one percent (1%)!
Notice that there are 99 blocks remaining in the tile.
That means 99 out of the original 100 remain, or 99%!
...or 100% of the original tile!
Calculating discounts and sale prices
Calculating sales tax and tips
Interpreting nutritional information on foods
Calculating income tax
Understanding data represented in
the media
Introduction to Percents
By Greg Reed
Marian University
Full transcript