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A tenth and one tenth are the same thing.
'Deci' means tenth, as in decimetre = a tenth of a metre, decilitre equals a tenth of a litre and so on.
It is a difference of 100X. The tenth place is the first column to the right of the decimal place. The tens place is the second column to the left of the decimal place.
The ratio of their sizes is 10 to 1 .One tenth is ten times the size of one hundredth.One hundredth is one tenth the size of one tenth.One tenth is nine hundredths larger than one hundredth is.In the sense of subtraction, the 'difference' is: (1/10) - (1/100) = 9/100
9 is already rounded to the nearest unit, so rounding to a tenth makes no difference.