口算.17×50= 107×4= 60×15= 130×0= 50×40=70×13= 270×3= 16×50= 190×5= 3×60÷3×60=
口算:0.4×0.02= 3.2+6.8= 0.39÷1.3= 2.4×2.5=1÷0.125= 1﹣0.25= 0.62÷0.1= 99×0.25=1.2×0.4+0.4×1.3= 4×(1.5+0.25)=
估算下面各题. 4.03×1.98≈ 3.95×0.2≈ 8.1×10.01≈ 16.2÷1.9≈59.8÷3.1≈ 10.32÷0.21≈ 99.9÷0.5≈ 70.2×3.02≈
估算.3.75×2.8≈ 96.2÷0.26≈ 6.27÷1.9≈
口算.450÷9×5= 3.7÷100= 1﹣0.09= 6+6÷6×0=4.3×1000= 363+3.66= 35+24﹣12= 9.9﹣(7.9﹣1.8)=0.35÷10= 0.38+1.2= 26+78÷13= 24×5÷24×5=
直接写出得数.360÷36= 0.3÷100= 120×6= 3﹣1.4= 480÷60=336÷12= 6.38+1.25= 0÷123= 125×7×8= 10﹣2.3﹣2.7=