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Ten hundredths equal a tenth. For example, when you add 1 hundredth (0.01) to 9 hundredths (0.09), you get 1 tenth (0.1).
Half of a tenth is 0.05
One tenth of a centimetre is equal to 1 millimetre.
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Well 1 tenth = 0.1, and half of that is 0.05, so add them together: 0.1 + 0.05 = 0.15 mile.