口算． 25×4= 20×300= 2400÷40= 3200+800= 39万+12万=80万﹣27万= 0÷99= 40×70= 690000﹣270000= 450000+580000=
直接写得数 24×= 72×= 12÷=÷3= 0÷=3÷=×=﹣×0=
口算×15=×2=×=×=÷=÷3=÷5=÷=
画一画． （1）= （2）÷4=
直接写结果：×3= 1÷= 1﹣﹣=×= 3﹣4×=×12=÷=+= 1﹣﹣=﹣=
直接写出得数×3=×=﹣0.25= 72×=÷=÷= 36÷=÷=
= 72×
= 12÷
=
÷3=
=3÷
=
×
=
×0=
×15=
×2=
×
=
×
=
÷
=
÷3=
÷5=
÷
=
=
÷4=
×3= 1÷
= 1﹣
﹣
×
= 3﹣4×
=
×12=
÷
=
+
= 1﹣
﹣
=
﹣
=
×3=
×
=
﹣0.25= 72×
=
÷
=
÷
= 36÷
=
÷
=
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