4 cm, exactly as in the question. 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. A decimal representation does not require a decimal point.
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12.0 cm
To write 3 cm as a decimal, you need to convert centimeters to meters first. There are 100 centimeters in 1 meter, so 3 cm is equal to 0.03 meters. To express this as a decimal, you simply write it as 0.03.
20.0 cm, possibly.
Well how you write 4 percent as a decimal is 0.04
It is: 4/10 = 0.4 as a decimal