It means 8.2
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2 copies of 4 tenth is 8 tenth.
32 tenths is the same as (3 and 2 tenths).So (8) and (32 tenths) is the same as (8) and (3 and 2 tenths), which is 11.2 .
As a mixed number 2.8 is 2 and 8/10 or 2 and 4/5 simplified
20 tenths
It is digit and it is 0, if you mean tenths, 8 if you mean tens.