4.09×0.9{#blank#}1{#/blank#}4.09          2÷4.5{#blank#}2{#/blank#}2÷5.4    40.9÷0.25{#blank#}3{#/blank#}40.9×0.25

0.58÷0.99{#blank#}4{#/blank#}0.58     6.3÷0.1{#blank#}5{#/blank#}6.3×10   9.6×0.98{#blank#}6{#/blank#}0.96×98

10.7×0.84=               ☆4.217÷5.4≈             12.6÷4.5=

23.                  

①2.08×8.5=            ②0.864÷0.32= 

③2.4×1.6=              ④3.01÷3.3≈ 

﹣11{#blank#}1{#/blank#}10         5.2×1.1{#blank#}2{#/blank#} 5.2×0.1。