0.47×8=3.76;
0.4 7
×8
37.6
4.08×5=20.4;
4.08
×5
20.40
0.36×12=4.32;
0.36
×12
72
36
4.32 ;
4.8×15=72.
4.8
×15
240
48
72.0 .