96703<9□805 4□37900<4582000 27□128>274600
72÷6=
230+80=
360÷18=
350÷5=
150×6=
350÷70=
725﹣85=
52×248≈
612÷29≈
632÷92≈
40×20=(4×10)×(2×10)=(4×2)×(10×10)=8×100=800
0.4×0.2=(4×0.1)×(2×0.1)=( × )×( × )= ×
=(4× )×(2× )=( × )×( × )= ×