一、口算。
$72 - 27 =$
$3×62 =$
$72÷4 =$
$7×14 =$
$92÷2 =$
$15 + 75 =$
$250×0 =$
$350÷7 =$
$61×10 =$
$808÷8 =$
$60×20 =$
$70 + 203 =$
$150×6 =$
$570 - 380 =$
$82×20 =$
$721÷7 =$
$15×80 =$
$340÷2 =$
$409×2 =$
$360÷3 =$
$16×40 =$
$190÷5 =$
$133×3 =$
$20×49 =$

一、45 186 18
98 46 90
0 50 610
101 1200 273
900 190 1640
103 1200 170
818 120 640
38 399 980

二、用竖式计算，带 * 的要验算。
$33×33$
$40×98$
$*76×83$
$32×19$
$51×62$
$*27×53$

二、1089 3920 6308
608 3162 1431