It is: 4.38% = 0.0438
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0.438
438, exactly as in the question. A decimal is a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right. A decimal representation does not require a decimal point. Adding zeros after the decimal point is wrong because they imply a degree of accuracy (significant figures) for which there is no justification.
Dr. Pepper rule. DP means decimal to percent move decimal to right to get percent. Move decimal to the left to change percent to decimal. 25.3%=.253
To convert a percent to a decimal, express the percent as a decimal then move the decimal point to the left two places:80.5% = 0.805