计算：218×3= 408×6= 280×5= 630÷6= 2703÷9= 508÷7=
直接写出得数．×8=÷2=×=÷=÷=﹣0.6=×=÷10=+=÷= 16×= 1﹣7%=
直接写得数． 1÷=÷2= 4×20%=×4= （+）×12= 1÷75%= 1%÷10%= 42%﹣0.42=
直接写得数． 12×= 6÷=÷= 1÷×=×18=×0×=×=×26=
直接写出得数．×60= 12÷= 3.14×42=（）2=×=+=÷=÷=
直接写得数．×4=+=+=÷= 25÷=﹣=÷5=×= 2÷=﹣=×12= 2﹣﹣=
×8=
÷2=
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=
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÷10=
+
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= 16×
= 1﹣7%=
=
÷2= 4×20%=
×4=
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）×12= 1÷75%= 1%÷10%= 42%﹣0.42=
= 6÷
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= 1÷
×
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×18=
×0×
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×
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×26=
×60= 12÷
= 3.14×42=（
）2=
×
=
+
=
÷
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=
×4=
+
=
+
=
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