口算我最行．
0.25×2=        89.3×0.6=      5÷0.25=       6.5×6.7+3.5×6.7=
9.6÷32=        65÷1.3=        0.28÷4=       50×7.89×0.2=
1÷4=           28÷0.02=       28÷0.5=       0.4×3.2×2.5=