16.45=×=×
1.645=×=×
m×n= a×b×10= c×1= a×a=
1.6×0.131.6 1.6×2.32.3
2.07÷3.11
0.55÷0.890.55 5.67÷0.1256.7÷1.2
5.4×1.8=
0.54×180=
9.72÷1.8=