6.3+3.7= 9-1.8= 1.4×0.5= 0.49÷0.7=
3.9-0.39= 1÷0.02= 0.51÷0.3= 12.5×8=
1.53+0.8= 1.21÷0.11= 0.9÷3= 6÷5=
