0.9
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4 tenths
Nine tenths of 80 is calculated by multiplying 80 by 0.9. This results in 72. Thus, nine tenths of 80 equals 72.
9/10 = 0.9
Sixty nine and seven tenths as a mixed number = 697/10
0.4 + 0.5 = 0.9, or nine tenths.