90 cm
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1 tenth
1 and 9/10 + 1/10 = 2
1/10 + 8/10 = 9/10
450
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