© Math Learning e-Resource Center Percent © Math Learning e-Resource Center

OBJECTIVES: Convert percents into decimal numbers Convert decimal numbers into percents

Percent means per hundred. What is Percent ?? Percent means per hundred.  % is the symbol that we use to notate percent. Some examples of percentages are: 15% = 15/100 = .15 25% = 25/100 = .25 100% = 100/100 = 1.00

Here we go….. Example 1: Write 57% as a decimal. Writing a Percent as  a Decimal Number When you are going from percent to decimal,  drop the percent sign and then move your decimal two places to the left. Example 1:  Write 57% as a decimal. Solution : Dropping the percent sign and then moving the decimal two places to the left we get: 57% = . 57

Cont… Solution : Example 2: Write 145% as a decimal. Dropping the percent sign and then moving the decimal two places to the left we get: 145% = 1.45 Example 3:  Write .34% as a decimal. Solution: Dropping the percent sign and then moving the decimal two places to the left we get: . 34% = .0034

Writing a Decimal Number as a Percent When you are going from decimal to percent, move your decimal place two to the right and then put a % sign at the end of the number. Example 4:  Write .78 as a percent. Solution: Moving the decimal place two to the right and then putting a % sign at the end of the number we get: .78 = 78%

Cont… Solution: Example 5: Write 8 as a percent. Moving the decimal place two to the right and then putting a % sign at the end of the number we get: 8.00 = 800% Example 6:  Write .0325 as a percent. Solution: Moving the decimal place two to the right and then putting a % sign at the end of the number we get: .0325 = 3.25%

Practice Problems : Write each percent as a decimal. a)  82% b)  325% Answer/Discussion to a) 82% Dropping the percent sign and then moving the decimal two places to the left we get: 82% = . 82 Answer/Discussion to b) 325% Dropping the percent sign and then moving the decimal two places to the left we get: 325% = 3.25

Practice Problems: Write each decimal as a percent. Answer/Discussion to a) 0.64 Moving the decimal place two to the right and then putting a % sign at the end of the number we get: .64 = 64% Answer/Discussion to b) 0.0003 Moving the decimal place two to the right and then putting a % sign at the end of the number we get: .0003 = .03%

Basic Math: Percent by Open University Malaysia is licensed under a Creative Commons Attribution-Noncommercial 3.0 Unported License. Based on a work at http://oer.oum.edu.my. Permissions beyond the scope of this license may be available at http://www.oum.edu.my.