When we talk about "Percent", we mean "per hundred"

50% means 50 per 100
(50% of this box is coloured)
percent-grid-50.gif

25% means 25 per 100
(25% of this box is coloured)
percent-grid-25.gif

100% means ALL (100/100)
percent-grid-100.gif
For example,
100% (or ALL) of 80 = 80
This is calculated using the method
100/100 x 80 = 80
50% means HALF
50_out_of_100.JPG half.JPG
percent-grid-50.gif
50% (or HALF) of 80 = 40
This is calculated using the method
50/100 x 80 = 40
25% means QUARTER
1_in_4.JPGquarter.JPG
percent-grid-25.gif
25% (or QUARTER) of 80 = 20
This is calculated using the method
25/100 x 80 = 20
5% means 5/100ths (5/100)
percent-grid-5.gif
5% of 80 = 4
This is calculated using the method
5/100 x 80 = 4



Because Percent means "per 100" you should think
"this should be divided by 100".
EXAMPLE:

75% means 75/100
75% of 200 =
75/100 x 200 =
150


100% is 100/100 or exacly 1 (100% of any number is just the number, unchanged)
100% of 200 =
100/100 x 200 =
200


200% is 200/100 or exactly 2 (200% of any number is twice the number)
200% of 200 =
200/100 x 200 =
400






Try this online quiz then come back and complete Task 1.







TASK 1:
Go to http://resources.oswego.org/games/PercentPaint/ppaint.html
Colour in some squares to show a percentage amount.
Save a copy of your picture - see How to create your image if you need help.
Check out the example here - Example
Post your picture here - Upload your image here



Once you have completed task 1, move on to decimals, fractions and percentages.

Sources:

http://www.mathsisfun.com/percentage.html

http://nlvm.usu.edu/en/nav/frames_asid_160_g_1_t_1.html?open=activities&from=topic_t_1.html

http://www.mathgoodies.com/lessons/toc_vol4.html