This is two problems. To convert a ratio to a decimal, divide the first number by the second number.
To round a number to a particular digit, look at the digit immediately to the right of your target, in this case, the thousandths place. If that digit is 4 or lower, zero it and everything to the right of it out. If that digit is 5 or higher, increase the target digit by one and zero everything to the right of it out. If your target digit is a 9, increasing it will turn it to zero and increase the digit to the left of it by one.
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To express 165 as a decimal to the nearest hundredth, we would write it as 165.00. This is because the hundredth place is two decimal places to the right of the decimal point. Therefore, we do not need to make any changes to 165 to represent it to the nearest hundredth.
33 and 1 hundredth as a decimal is 33.01
5.00
0.080.08
It is 23 although to show that it is to the nearest hundredth, you could write it as 23.00