估算：79÷5≈ 80÷4≈ 81÷2≈ 82÷8≈
直接写出得数×3=×=﹣0.25= 72×=÷=÷= 36÷=÷=
直接写得数．×16= 12÷= 0.3×=÷= 1÷= 0×===
直接写得数 4÷= 0×=÷=×1.4=×= 0÷=×10= 30×0.05=
直接写出得数．========
口算． 4.2÷=×3=÷5=（+）×72=×12=×1.8=÷=
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×3=
×
=
﹣0.25= 72×
=
÷
=
÷
= 36÷
=
÷
=
×16= 12÷
= 0.3×
=
÷
= 1÷
= 0×
=
=
=
= 0×
=
÷
×1.4=
×
=
×10= 30×0.05=
=
=
=
=
=
=
=
=
=
×3=
÷5=（
+
）×72=
×12=
÷