To express 150 as a decimal, you simply write it as 150.0. To convert 150 to a fraction, you can write it as 150/1, which is already in simplest form.
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150 is an integer so as a decimal it is 150, exactly as in the question. One possible fractional representation is 150/1.
150% as a decimal translate to: 1.50. In fraction form this would equate to exactly 150/100.
150/50 = 150 ÷ 50 = 3
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. If it does not contain a fractional part then the decimal representation does not require a decimal point. So the decimal for 150 ohms is 150 ohms. If you want it as a decimal fraction of some other quantity then you need to specify that second quantity.
you can change a fraction to a decimal by dividing the bottom number into the top number.
You do nothing. 1.50 is a fraction. It is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. Its rational equivalent is 150/100 which can be simplified, if required. However, simplification will result in a loss of information about the accuracy of the fraction.