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The thousandth place in a decimal would be the 3rd number after the decimal point. For this number, you would round to 112.457 because if the next number is 5 or greater, you will round up. If the next number is less than 5, the number in the thousandths place would remain unchanged.
20 is a number above the decimal point, so writing it as a decimal is not really possible. You could write 20.0 and include the next numbers place, but it's the same number.
It is 1.1
The next number!
Really there is no answer to this, because the question doesn't quite make sense.If you were to allow only one decimal place after the decimal point, then the number after 0.7 would be 0.8.But in reality there can be any number of decimal places.For example 0.71 comes after 0.7, but so does 0.701, and so does 0.70000304050.There is no way to decide which is next.