一、口算。
$32÷4=$
$9×3=$
$33÷9=$
$39÷3=$
$520+80=$
$210-80=$
$11×8=$
$220-80=$
$69÷3=$
$150-70=$
$2×31=$
$190+70=$
$340+120=$
$360-80=$
$30×3=$
$73-38=$
$28+35=$
$42÷5=$
$12×4=$
$800+800=$
$71-33=$
$54÷6=$
$60÷2=$
$270+230=$

8
27
3……6
13
 600
 130
88
140
23
80
 62
260
460
 280
 90
35
63
8……2
48
1600
 38
9
30
500

二、用竖式计算。
$842-345-355$
$265+324-436$
$255+48+336$
$432+268+197$
$705-687+123$
$652-84-326$

解：
1. $842-345-355$
$\begin{array}{r}842\\-345\\\hline497\\-355\\\hline142\end{array}$
结果为$\boldsymbol{142}$
2. $265+324-436$
$\begin{array}{r}265\\+324\\\hline589\\-436\\\hline153\end{array}$
结果为$\boldsymbol{153}$
3. $255+48+336$
$\begin{array}{r}255\\+48\\\hline303\\+336\\\hline639\end{array}$
结果为$\boldsymbol{639}$
4. $432+268+197$
$\begin{array}{r}432\\+268\\\hline700\\+197\\\hline897\end{array}$
结果为$\boldsymbol{897}$
5. $705-687+123$
$\begin{array}{r}705\\-687\\\hline18\\+123\\\hline141\end{array}$
结果为$\boldsymbol{141}$
6. $652-84-326$
$\begin{array}{r}652\\-84\\\hline568\\-326\\\hline242\end{array}$
结果为$\boldsymbol{242}$