算一算，比一比．
13×30= 20×32= 11×60= 50×40=
13×300= 200×32= 11×600= 50×400=
130×30= 2000×32= 110×60= 500×40=
算一算，比一比．
13×30= 20×32= 11×60= 50×40=
13×300= 200×32= 11×600= 50×400=
130×30= 2000×32= 110×60= 500×40=
=
×15= 2﹣
= 1+2%=
+
×
=
÷
= 5÷
=
×75%
×4×
=
×99+99×
=
÷
= 12÷
=
÷
=
÷
=
÷16=
÷
=
÷
=
÷
（2）38÷
（3）
÷
（4）
÷13．
=
+
=
= 1﹣25%=
÷18=
+
）=
×
= 4.3×99+4.3=
=
=
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