Hundredth Part: If you divide any thing into 100 equal parts, then each part would be known as hundredth part.
Percentage: By a certain percentage, we mean “that many hundredth”
We denote percentage by , thus
Convert a Percentage into a Fraction
For converting a percentage into fraction, divide it by and remove the sign.
Convert Fraction into Percentage
For converting a fraction into a percentage, multiply the fraction by and add sign to the resultant.
Convert a Percentage into a Ratio
A percentage can be expressed as a ratio with the first term equal to the given percentage and the second term equal to
Convert Ratio into a Percentage
First write the ratio as a fraction and then multiply the fraction by and put sign.
Convert a Percentage into a Decimal
First convert the percentage into fraction and then convert fraction into a decimal.
Convert a Decimal into a Percentage
First convert the given decimal into a fraction and then multiply the fraction by and add sign.
Increasing or Decreasing a certain Quantity by a Certain Percentage
- If you have to increase a number a by , then the new number would be
- If you have to decrease a number a by , then the new number would be