12×0.312 8.01÷81 4.5×1.24.5
56705769 999910000
31942989 70867068
9800 8009 9008 9900 10000
<<<<
428<4239 300<3800
550<5600 224<2254
8.4-5.6= 1.25×0.08= ÷8=
4÷0.2= 50×4%= 7× ÷7× =