90÷3= 2﹣1.8= 300×14= 8000÷8=40×70= 1200÷3= 0÷8= 500×300=3600÷4= 11×60= 27×30= 5﹣1.6=89×40≈ 23×49≈ 4.8+6= 93×60≈
直接写得数. 3×5= 12.5×8= 5.4÷9= 10÷0.1= 0.6×0.2= 4.2÷0.7= 8×0.04= 2.4÷0.03= 0÷2.43= 6.6÷10= 9×0.8= 1×10.2= 6.4×0.5= 1.44÷0.2= 36÷0.6= .
口算 0.25×4= 3.02×0.2= 100÷0.8= 3×1.2= 3.14+0.56= 25×8= 36÷1.2= 10﹣0.9=
口算 3.4÷2= 0.48÷6= 4.6÷0.23= 1.4×0.5= 6.8÷4= 0.72÷12= 8×1.01= 5.2÷13=
口算 8×5.1= 1.5÷0.03= 0.9÷0.9= 4.2×3= 6.3+7= 1.5÷0.3=
用竖式计算. 2.5×44= 64.8÷18= 14.3×38= 1.69÷26=