Interest in Math

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.

  

Conversion of fractions to percents

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.

1 = 100%

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%