口算
7.2÷9=
﹣
=
﹣
+
=
+
= 5﹣
=
﹣×0=
8×25%=
÷20%= 24÷（1﹣20%）=
直接写对又快得数：
0.65÷1.3= 0.32﹣0.23= 586﹣198= 4.38﹣（2.38﹣1.8）=
﹣
=
×
÷×= 3.8+12= 4÷
﹣
÷4=
直接写出得数．
0.42×0.5= 0.51÷1.7= 5.2÷0.13= 32.8+19= 1.06×0.4=
+
=1﹣
=
直接写出得数．
8÷0.1= 6÷7=
+
=
﹣
=
7.8﹣0.08= 0.6×0.5= 1﹣
= 18÷36=
直接写出得数．
1.53﹣0.5= 7.8+0.9= 1+
= 12÷0.4=
0.56+4.44= 2，9+3.7+2.1= 4×0.25= 1.25×5×8=
7.6×8+2.4×8=
+
）÷
﹣
．