How to Change Decimals to Percents - dummies

By Mark Zegarelli

Calculating with percents is easiest when you convert to decimals first. When you’re done calculating, however, you often need to change your answer from a decimal back to a percent. This is especially true when you’re working with interest rates, taxes, or the likelihood of a big snowfall the night before a big test. All these numbers are most commonly expressed as percents.

To change a decimal to a percent, move the decimal point two places to the right and attach a percent sign. If the result is a whole number, you can drop the decimal point.

Sample question

  1. Change 0.6 to a percent.

    60%. Move the decimal point two places to the right and attach a percent sign:

    0.6 = 60%

Practice questions

  1. Convert 0.57 to a percent.

  2. What is 0.3 expressed as a percent?

  3. Change 0.015 to a percent.

  4. Express 2.222 as a percent.

Following are answers to the questions:

  1. 57%. Move the decimal point two places to the right and attach a percent sign:

    0.57 = 057%

    At the end, drop the leading zero to get 57%.

  2. 30%. Move the decimal point two places to the right and attach a percent sign:

    0.3 = 030%

    At the end, drop the leading zero to get 30%.

  3. 1.5%. Move the decimal point two places to the right and attach a percent sign:

    0.015 = 01.5%

    At the end, drop the leading zero to get 1.5%.

  4. 222.2%. Move the decimal point two places to the right and attach a percent sign:

    2.222 = 222.2%