一间大厅，用边长0.4米的方砖铺地，需用324块，若改铺边长0.3米的方砖，需要多用几块？
0.9÷0.1= 2﹣2÷3= 3÷= 1﹣﹣= 190÷25÷4= 0.55×20= 1.2﹣= 2.7×=
直接写出得数． 0.6÷0.3= 2÷=+=×=﹣=÷=（+）×6=（2+）×8=
15÷0.25= 1.5×= 2.4+1= 1÷1.25×8= 24×== 10= 8+=×1.8=== 0.78+1+0.32=
直接写出得数． 1﹣45%= 0.4÷2.5= 15÷=×=÷=×=
口算． 8.1÷0.03=+3=×=﹣=×= 134﹣18= 1.5×4= 7.45+8.55= 25÷= 2.4﹣= 3.5×=×=
= 1﹣
﹣
=
= 2.7×
=
=
+
=
×
=
﹣
=
÷
=（
）×6=（2+
）×8=
= 2.4+1
= 1÷1.25×8=
=
= 10
= 8
+
=
×1.8=
=
= 0.78+1
+0.32=
=
×
=
÷
=
×
=
+3=
×
=
﹣
=
×
= 134﹣18= 1.5×4= 7.45+8.55=
= 2.4﹣
= 3.5×
=
×
=
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