Lecture
Percentage is one hundredth of a number.
The percentage is written using the% sign.
To convert percentages into fractions , you need to remove the% sign and divide the number by 100.
To convert the decimal fraction to percents, you need to multiply the fraction by 100 and add the% sign.
To convert an ordinary fraction to percents , you must first turn it into a decimal fraction.
As you understand, percentages are closely related to ordinary and decimal fractions. Therefore, it is worth remembering a few simple equalities. In everyday life, you need to know about the numerical relationship of fractions and percentages. So, half - 50%, 25%, three quarters - 75%, one-fifth - 20%, and three-fifths - 60%.
Knowing by heart the ratios from the table below will make it easier for you to solve many problems.
 |  |  | |||||||
| Fraction | 1/2 | 1/4 | 3/4 | 1/5 | 2/5 | 3/5 | 1/10 | 1/20 | 1/50 |
| Decimal | 0.5 | 0.25 | 0.75 | 0.2 | 0.4 | 0.6 | 0.1 | 0.05 | 0.02 |
| Interest | 50% | 25% | 75% | 20% | 40% | 60% | ten% | five% | 2% |
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