0.2×3.4=0.68; 2.4÷0.08=30; 3.7÷0.1=37;
10.8-7=3.8; 640÷40=16; 0÷4.2=0;
1÷0.25=4; 3.72+4.28=8; 0.45÷5=0.09;
50×0.2=10.