一、口算。
$70 - 12 =$
$80 ÷ 8 =$
$9 × 11 + 2 =$
$46 ÷ 2 =$
$12 × 2 =$
$4 × 35 ÷ 2 =$
$73 + 37 =$
$65 ÷ 5 =$
$630 ÷ 6 ÷ 5 =$
$52 × 3 =$
$16 × 3 =$
$103 × 4 - 12 =$
$660 ÷ 6 =$
$102 × 3 =$
$100 - 72 ÷ 6 =$
$810 × 5 =$
$770 + 103 =$
$112 × 2 × 2 =$
$380 - 38 =$
$724 ÷ 4 =$
$(67 + 21) × 3 =$
$648 ÷ 6 =$
$312 × 6 =$
$400 ÷ (10 - 6) =$

一、58 10 101
23 24 70
110 13 21
156 48 400
110 306 88
4050 873 448
342 181 264
108 1872 100

二、用竖式计算，带 * 的要验算。

二、19……1 792
142……2
1328 1224
160……3