90
If you were rounding the number 92.1. The tenth would be the 1. However I believe you mean to the nearest ten. The rule for rounding is you round the number to the nearest number that ends in 0.
Basically 1-4 rounds down. 5-9 rounds up.
The numbers 91,92,93,94 round down to 90.
The numbers 95, 96, 97, 98 round up to 100.
So 92 rounds down to 90.
92.0
19.125 rounded to nearest tenths is 19.1
5.8
26.7
5.3
Five rounded to the nearest tenths is 5.0
7.0
98484.0
50.3
15.4
7.2
12.5