Four fifths divided by one tenth is 8
7 divided by one tenth is 707/0.1 = 7*10 = 70
2.0 divided by one tenth is 20. Don't know what modelling has to do with it, though.
one-tenth
One tenth = one divided by 10 = 0.1
No.
One third divided by two and one third = 1/7
One tenth
210
1/30
90 divided by one third = 270
45 multiplied by one-third = 15; 45 divided by one-third = 135.