Instruction

1

Solve problems involving percentages simple enough, but there are certain rules. One percent is defined as a hundredth part of the number. For example, 1% is 0.01, and 5%=0,05 etc.

When solving problems on percentages, you must determine the percentage of the number example could be the calculation of 20% of 450. To solve this problem, there are two ways: 20% *0,45=90 or 450*20/100=90

When solving problems on percentages, you must determine the percentage of the number example could be the calculation of 20% of 450. To solve this problem, there are two ways: 20% *0,45=90 or 450*20/100=90

2

For solving problems of interest can be identified several ways:

1. the percentage number is calculated by multiplying the number by the percent written as a decimal fraction;

2. the percentage of one number from another is computed by dividing the first number by the second, and the fraction is written in the form of interest;

3. the percentage of two numbers is determined by the formula: a/b*100%.

1. the percentage number is calculated by multiplying the number by the percent written as a decimal fraction;

2. the percentage of one number from another is computed by dividing the first number by the second, and the fraction is written in the form of interest;

3. the percentage of two numbers is determined by the formula: a/b*100%.

Note

How to solve problems on percentages? These questions come up, alas, suddenly, When a graduate reading exam task. The only thing you need to remember train – what is the one percent. This concept is the main key to solving the problems on percentages, and work with percentages at all. One percent is one hundredth part of a number.

Useful advice

Main types of solving problems on percentages. I. finding parts from the whole. To find the percentage of the whole, need the number to multiply by (percent converted to decimal). EXAMPLE: IN a class of 32 pupils. During the audit work were absent 12.5% of the students. Find out how many students were absent? SOLUTION : an Integer in this problem the total number of students (32).