One tenth can also be expressed as 0.1; 0.8 + 0.1 = 0.9. Thus, the sum of 0.8 and one tenth (1/10) is 0.9.
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3/10
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).
One tenth = 0.1 One hundredth = 0.01 0.1 + 0.01 = 0.11 (or eleven hundredths)
Find the tenth place 0.X00 Add 1 to that place. 1.623 plus one tenth more is 1.723
They add up to 4/5