It is: achtundvierzig (eight and forty).
fortyeight
0.048
1/4
40,048,000,000
fortyeight
1 third divide 6 eight = 0.16666666666666666
75
8/0 = 0 you can't divide by zero
yes
If you divide eight by pi, you get 2.54647909 as the diameter. If you divide eight by 3.14 (simplified pi), you get 2.54777070 as the diameter.
If it's a serious question, six; if it's a trick then just the one that comes after the 4.