0.2 is already in decimal form.
It would be read as: two-tenths, or two-tenths (of one). Or, since it can be read as a fraction, since 0.2 is less than one, you would have 20%. Another way to understand this decimal is to convert it to it's lowest common denominator. Understanding that 0.2 = 2/10 (two-tenths), you can see that you can divide the numerator and the denominator by 2 and get an answer of 2/10 = 1/5.
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As a percent, .02 is 2 percent. To convert from decimal to percent, you move the decimal point two places to the right. When converting from percent to decimal, you move the decimal point two places to the left.
.02
move the decimal to the left 2 times and you will get the decimal Examples: 25% = .25 56.8% = .568 2% = .02
As a number, it means 16+8+1, or 25 in decimal
A decimal number is simply 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. So 20 ml is simply 20 ml.