文档介绍：口算
32×3= 60×3= 18×10= ×100= 6÷100=
49×2= 12×7= 24×100= ×100= ÷100=
43×4= 72×5= ×10= ÷10= ÷100=
32×4= 82×5= ×100= ÷100= ÷10=
口算
14×9= ×2= ×200= 23×= ×3=
17×8= 5×= ×40= ×80= ×7=
20×4= ×4= 100×= ×20= ×5=
42×3= ×0= 3×= ×40= ×20=
口算
×3= ×40= ×10= 4×= ×2=
×4= ×4= ×40= 10×= ×6=
×7= ×4= 2×= ×4= ×5=
×3= ×8= 3×= ×7= ×9=
口答它们的积有几位小数
×= ×= ×= ×= ×=
×= ×= ×= ×= ×=
×3= ×= ×= ×= ×=
口算
×= ×8= ×2= ×= ×2×=
4××= 7××0= ××= + ×5 =
计算
×8= ×17= ×5= ×2= 3××7=
×= ×= ×4= ×8= 5×4×=
×= ×10= ×= ×7= 8××5=
×× = ×+×
计算
×= += ×2= ×= ×=
×= -= ×= ×7= ×70=
×5= += ×= ×= ×=
×5= -= 90×= ×= ×=
计算
×= 43×= ×7= ×= ×=
×= ×5= ×= ×= ×=
×= ×= ×20= 65×= ×=
×= ×4= ×= ×50= ×=
口算
-= ×= ×= ×200= ×=
+= ×500= ×= ×3= 30×=
×-×= ××= ×+×=
口算
×= ×= ×= ×3= ×=
×4= ×= ×100= 30×= ×2=
20×+= +×8= ×-×=
口算
×= ×= ×= ×= ×=
×3= ×= ×30= ×0= ×=
×4×= 102 ×-2×= 104×= ×5
口算
76÷2= 721÷7= ÷10= ×= ×20=
60÷6= 905÷5= 435÷100= ×2= ×100=
57÷3= 800÷40= ÷100= 64÷4= 315÷1000=
口算
×= ÷4= ÷9= ÷2= ÷4=
70×= ÷4= ÷7= ÷6= ÷8=
×6= ÷3= ÷8= ÷9= ÷3=
×