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. It may or may not contain a fractional part. If not, the decimal representation does not require a decimal point. So the decimal for 20 ms is 20 ms. If you want it as a decimal fraction of some other quantity then you need to specify that second quantity.
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20/100 as a decimal is 0.20
Oh, isn't that just a happy little question! To write 20 hundredths in a decimal, you simply place the number 20 after the decimal point. So, 20 hundredths would be written as 0.20. Just remember, decimals are like little friends that help us understand parts of a whole.
17/20 written as a decimal is 0.85
20/100 written as a decimal is 0.2 or 0.20
0.2