Not hard at all. To change a percent to a decimal, express the percent as a decimal and simply move the decimal to the left two places: 12.75% = 0.1275

To change 3 and a half to a decimal you can either do 3.5, 3.50 or 3.500. A half as a decimal is 0.5 and 3 is already a decimal number so 3 and a half is 3.5 in decimal form.

3.4% in decimal form is .034. Remember - to change a percentage to decimal move the decimal point TWO (2) places to left. To change a decimal to a percentage - move the decimal point TWO (2) places to the right.