列坚式计算。（共 12 分）

(1) $510-260=$

(2) $150+750=$

(3) $820-380=$

(4) $620-450=$

(5) $530+280=$

(6) $800-170=$
: (1) $510-260=250$

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(2) $150+750=900$

| 150 |
| ---: |
| $+\quad 750$ |
| 900 |

(3) $820-380=440$

820

$\begin{array}{r}-380 \\ \hline 440\end{array}$

(4) $620-450=170$

$\begin{array}{r}620 \\ -\quad 450 \\ \hline 170\end{array}$

(5) $530+280=810$

$\begin{array}{llll}5 & 3 & 0\end{array}$

$\begin{array}{r}+280 \\ \hline 810\end{array}$

(6) $800-170=630$

$$
\begin{array}{r}
800 \\
-\quad 170 \\
\hline 630
\end{array}
$$