17/20
The sum of (eight and nine tenths) plus (nine and eight tenths) is (eighteen and seven tenths). 8.9 + 9.8 = 18.7
8.9
It is seventy-eight and nine tenths.
Nine tenths minus eight fifteenths equals eleven thirtieths.
Nine of them. All consecutive integers have nine tenths between them.
8.9
Nine and eight tenths.
$8.90
Eighty-nine.
Sixty nine and seven tenths as a mixed number = 697/10
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Eight-teen twenty'ths