100520 − 470 * 50 + 13980 = 100520 − 23500 + 13980 = 77020 + 13980 = 91000
1) $\begin{array}{r}\begin{array}{r}\times \end{array}\underline{\begin{array}{r}\mathrm{470 }\\ \mathrm{50 }\end{array}}\\ \begin{array}{r}\mathrm{23500 }\end{array}\end{array}$;
2) $\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}100520\\ 23500\end{array}}\\ \begin{array}{r}77020\end{array}\end{array}$;
3) $\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}77020\\ 13980\end{array}}\\ \begin{array}{r}91000\end{array}\end{array}$.
 
14110 + 801000 : 900 − 7604 = 14110 + 890 − 7604 = 15000 − 7604 = 7396
1) $\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}801000\\ \phantom{0}\underset{¯}{7200}\\ \phantom{0}\underset{¯}{\phantom{0}}8100\\ \phantom{00}\underset{¯}{8100}\\ \phantom{00000}\underset{¯}{\phantom{0}}0\\ \phantom{000000}\underset{¯}{0}\\ \phantom{000000}0\end{array}& \begin{array}{l}\overline{)900}\\ \overline{\overline{)890}}\end{array}\end{array}$;
2) $\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}14110\\ 890\end{array}}\\ \begin{array}{r}15000\end{array}\end{array}$;
3) $\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}15000\\ 7604\end{array}}\\ \begin{array}{r}7396\end{array}\end{array}$.
 
734600 : 50 + 454 * 40 = 14692 + 18160 = 32852
1) $\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}734600\\ \phantom{0}\underset{¯}{50}\\ \underset{¯}{\phantom{0}}234\\ \phantom{0}\underset{¯}{200}\\ \phantom{0}\underset{¯}{\phantom{0}}346\\ \phantom{00}\underset{¯}{300}\\ \phantom{00}\underset{¯}{\phantom{0}}460\\ \phantom{000}\underset{¯}{450}\\ \phantom{000}\underset{¯}{\phantom{0}}100\\ \phantom{0000}\underset{¯}{100}\\ \phantom{000000}0\end{array}& \begin{array}{l}\overline{)50}\\ \overline{\overline{)14692}}\end{array}\end{array}$;
2) $\begin{array}{r}\begin{array}{r}\times \end{array}\underline{\begin{array}{r}\mathrm{454 }\\ 40\end{array}}\\ \begin{array}{r}\mathrm{18160 }\end{array}\end{array}$;
3) $\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}14692\\ 18160\end{array}}\\ \begin{array}{r}32852\end{array}\end{array}$.
 
(560 − 12240 : 30) + 145 = (560 − 408) + 145 = 152 + 145 = 297
1) $\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}12240\\ \phantom{0}\underset{¯}{120}\\ \phantom{00}\underset{¯}{\phantom{0}}24\\ \phantom{0000}\underset{¯}{0}\\ \phantom{00}\underset{¯}{\phantom{0}}240\\ \phantom{000}\underset{¯}{240}\\ \phantom{00000}0\end{array}& \begin{array}{l}\overline{)30}\\ \overline{\overline{)408}}\end{array}\end{array}$;
2) $\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}560\\ 408\end{array}}\\ \begin{array}{r}152\end{array}\end{array}$;
3) $\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}152\\ 145\end{array}}\\ \begin{array}{r}297\end{array}\end{array}$.
 
400000 − 867 * 400 = 400000 − 346800 = 53200
1) $\begin{array}{r}\begin{array}{r}\times \end{array}\underline{\begin{array}{r}\mathrm{867 }\\ 400\end{array}}\\ \begin{array}{r}\mathrm{346800 }\end{array}\end{array}$;
2) $\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}400000\\ 346800\end{array}}\\ \begin{array}{r}53200\end{array}\end{array}$.
 
9805 + 146510 : 70 = 9805 + 2093 = 11898
1) $\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}146510\\ \phantom{0}\underset{¯}{140}\\ \phantom{00}\underset{¯}{\phantom{0}}65\\ \phantom{0000}\underset{¯}{0}\\ \phantom{00}\underset{¯}{\phantom{0}}651\\ \phantom{000}\underset{¯}{630}\\ \phantom{000}\underset{¯}{\phantom{0}}210\\ \phantom{0000}\underset{¯}{210}\\ \phantom{000000}0\end{array}& \begin{array}{l}\overline{)70}\\ \overline{\overline{)2093}}\end{array}\end{array}$;
2) $\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}9805\\ 2093\end{array}}\\ \begin{array}{r}11898\end{array}\end{array}$.
 
8213 * 30 − 12240 : 30 = 246390 − 408 = 245982
1) $\begin{array}{r}\begin{array}{r}\times \end{array}\underline{\begin{array}{r}\mathrm{8213 }\\ 30\end{array}}\\ \begin{array}{r}\mathrm{246390 }\end{array}\end{array}$;
2) $\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}12240\\ \phantom{0}\underset{¯}{120}\\ \phantom{00}\underset{¯}{\phantom{0}}24\\ \phantom{0000}\underset{¯}{0}\\ \phantom{00}\underset{¯}{\phantom{0}}240\\ \phantom{000}\underset{¯}{240}\\ \phantom{00000}0\end{array}& \begin{array}{l}\overline{)30}\\ \overline{\overline{)408}}\end{array}\end{array}$;
3) $\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}246390\\ 408\end{array}}\\ \begin{array}{r}245982\end{array}\end{array}$.
 
11140 : (2076 − 2056) = 11140 : 20 = 557
1) 2076 − 2056 = 20;
2) $\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}11140\\ \phantom{0}\underset{¯}{100}\\ \phantom{0}\underset{¯}{\phantom{0}}114\\ \phantom{00}\underset{¯}{100}\\ \phantom{00}\underset{¯}{\phantom{0}}140\\ \phantom{000}\underset{¯}{140}\\ \phantom{00000}0\end{array}& \begin{array}{l}\overline{)20}\\ \overline{\overline{)557}}\end{array}\end{array}$.