这本书共400页，每天看24页，看了15天．（1）已经看了多少页？（2）剩下的每天看20页，还要几天才能看完？
直接写得数：÷4= 1÷= ÷3= 14÷=÷0.4= ÷= ×= ×=75%+0.25= 1÷×1÷=
直接写出得数7÷= 24%×5= 5÷5%= 6.4×= +×=×7÷= 12×+6×= 1﹣+= 8÷﹣0.5= +0.9=
直接写得数．×= ÷2= ×= 68÷10%=×72% ×÷= ﹣+= 1﹣﹣=80%﹣20%= 4×25%+16×25%= ×÷×= （+）×12=
= = = == 0×1.27= = == = = 1.5÷25%+1.5=
口算：× 45× ÷10 0÷ 54×÷ ×64 12÷ （﹣）×24 3×÷3×．
÷4= 1÷
= 
÷3= 14÷
=
÷0.4= 
÷
= 
×
= 
×
=
×1÷
= 24%×5= 5÷5%= 6.4×
= 
+
×
=
×7÷
+6×
+
= 8÷
﹣0.5= 
+0.9=
×
= 
÷2= 
= 68÷10%=
×72% 
×
÷
= 
﹣
+
= 1﹣
﹣
=
×
÷
×
= （
+
）×12=
= 
= 
= 
=
= 0×1.27= 
= 
=
= 
= 
= 1.5÷25%+1.5=
×
45×
÷10 0÷
54×
÷
×64 12÷
（
﹣
）×24 3×
÷3×
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