直接写出得数529+198= 305﹣199= 2.05×4= 8×12.5%= +×0= =
直接写出得数．= 16×50%= 16÷==÷3== 4÷1%= 2+1÷= 7+= 1÷=
直接写出得数． 8×=÷=×÷×= 3.6×= 15π= 80×（1﹣60%）=
直接写出得数． 21×= 1÷=÷= 8×=÷=+= 5﹣=×=
直接写出得数． ①×5= ②×= ③2﹣= ④2÷= ⑤÷1= ⑥0×= ⑦×= ⑧÷= ⑨÷21= ⑩+=
口算：×3= ，×2= ，×= ，×= ，÷4= ，÷= ，÷= ，÷= ．
+
×0= 
=
= 16×50%= 16÷
=
=
÷3=
= 4÷1%= 2+1÷
= 7+
= 1÷
=
=
÷
=
×
÷
×
= 15π= 80×（1﹣60%）=
= 1÷
=
÷
= 8×
=
÷
=
+
= 5﹣
=
×
=
×5= ②
×
= ③2﹣
= ④2÷
÷1=
= ⑦
×
= ⑧
÷
= ⑨
÷21= ⑩
+
=
×3= ，
×2= ，
×
= ，
×
= ，
÷4= ，
÷
= ，
÷
÷
= ．
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