Wednesday, April 17, 2013

Math Percents Problems

Introduction to percentage:

In mathematics, a percentage is a way of expressing a number as a fraction of 100 (per cent meaning "per hundred" in French). It is often denoted using the percent sign, "%", or the abbreviation "pct". For example, 45% (read as "forty-five percent") is equal to `45 / 100` , or 0.45. In this article you will get help on how to find percentages with some example problems.

- Source from Wikipedia

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Help on finding percents:


To convert a fraction and a decimal to a percentage we have, multiply it by 100.

Similarly to convert a percentage to a fraction and decimal, divide it by 100.

We can express a fraction and a decimal as a percentage.

Is this topic math discount problems hard for you? Watch out for my coming posts.

Help on percentage problems:


Problem 1:

What is the decimal value of percentage 84%?

Solution:

84% =  ` 84 /100` = 0.84

84% is 0.84

Problem 2:

What is the decimal value of percentage 72.3%?

Solution:

72.3% = `(72.3) / 100 ` = 0.723

72.3% is 0.723

Problem 3:

How to add 89% to 23?

Solution:

89% + 23 = 0.89 + 23 = 23.89

Problem 4:

What is the 76% of 24?

Solution:

Let us take 76% as `76 /100`

76% of 24 =` 76 / 100` * 24

=  3.16

Problem 5:

In a box there are 72 peanut packets. If a girl took 60% of peanut packets, how many peanut packets did she left in the box?

Solution:

The girl took the peanut packets from the box is 60% of 72 or else `60/100` × 72

`60 / 100` × 72 = 43.2%

So the box contains 72 peanut packets and the girl took 43 peanut packets. The number of peanut packets girl left in the box is 72 – 43 = 29.
Therefore the girl left 29 peanut packets in the box.

Help on Practice problem for finding percentage:

Problem 1:

What is decimal value of the percentage  22%?

Solution:

= 0.22.

Problem 2:

What is the decimal value of percentage 61%?

Solution:

= 0. 61

Problem 3:

What is 84% of 22?

Solution:

= 18.48 is 84% of 22.

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