This Math quiz is called 'Calculating Simple Percentages' and it has been written by teachers to help you if you are studying the subject at middle school. Playing educational quizzes is a fabulous way to learn if you are in the 6th, 7th or 8th grade - aged 11 to 14.
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What is a percentage? A percentage is a way in which you can express a fraction (or a part of a whole) in portions of 100. In word form, a percentage would look like this:
Part/Whole = Percent/100
The symbol used to show percent is “%” so 17 percent would be 17%. The “17” is the “part” and the “%” is the whole which means that 17% can also be shown as 17/100.
How to Find the Percentage of Any Given Number:
In math you will often have to find the percentage of a number. For example, if you were to go shopping and you found a new shirt that was 20% off, you would need to know what is the number the 20% is off of. The sales tag on the shirt says $20.00. So now you would need to know how to find what 20% of $20.00 is. To do this you must multiply the number ($20.00) by the percent “20”. However if you multiply 20.00 x 20, you would get the answer: “400.00”. That would not be correct. Why, because we need to multiply $20.00 by 20%, not by “20”.
20% must be converted to a decimal number. We know that 20% also equals 20/100. The “100” (which replaces the % symbol) needs to be used to create a decimal number. To show 20/100 as a decimal, we must move a decimal point over to the left, beginning to the immediate right of the “0” in “20”, two spaces so 20/100 becomes .20. That decimal point is used in place of the “100” and/or the “%”. We can then multiply $20.00 by .20 so: 20.00 x .20 = 4.00. This tells us that 20% of $20.00 is $4.00.
How to Determine the Percentage of Any Given Number:
Now if you are looking to find what the percentage is, let’s say if you took 20 cans of soda from a package of 80, you would need to divide 20 by 80 so it would be written out as: 20 ÷ 80 = .25. Now we must reverse the decimal to a percentage. To do this, we now need to move the decimal point over two spaces to the right so that .25 becomes 25 and the decimal becomes the symbol “%” so the answer would be 25%. This means that 20 cans of soda removed from a package of 80 cans equals 25%.
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