0.6666 repeating
0.375
2.67
4/5 = 8/10 = 0.8
3/10 = 30/100 = 0.3
8.75
3 x 8 = 2424.0
7.5
Not unless you are going into decimals.
3/8 = 0.375 is a terminating decimal. If you must have it in the form of a repeating decimal it is either 0.375000... or 0.374999... The second may look an unlikely answer but I can assure you that, mathematically, the two decimals are equal.
They are decimals that have equal value.
3/8 is in its simplest form.