1.算一算。
8×78=
4×26=
682×8=
8×573=
8×67=
29×4=
796×6=
564×8=
24×6=
35×9=
836×7=
313×8=
9×47=
7×28=
5×738=
8×279=
37×8=
85×8=
3×398=
167×2=
66×4=
9×96=
136×9=
6×746=

8×78=624
4×26=104
682×8=5456
8×573=4584
8×67=536
29×4=116
796×6=4776
564×8=4512
24×6=144
35×9=315
836×7=5852
313×8=2504
9×47=423
7×28=196
5×738=3690
8×279=2232
37×8=296
85×8=680
3×398=1194
167×2=334
66×4=264
9×96=864
136×9=1224
6×746=4476

2.列竖式计算。
•45×3= •56×2= •28×4= •48×5=

•45×4= •55×2= •25×4= •45×5=

•728×5= •126×4= •136×5= •123×8=

•323×6= •125×4= •135×5= •125×8=

•45×3=135 •56×2=112 •28×4=112 •48×5=240
$\begin{array}{r} 45\\ ×_{1}3\\ \hline 135\end{array}$ $\begin{array}{r} 56\\ ×_{1}2\\ \hline 112\end{array}$ $\begin{array}{r} 28\\ ×_{3}4\\ \hline 112\end{array}$ $\begin{array}{r} 48\\ ×_{4}5\\ \hline 240\end{array}$
•45×4=180 •55×2=110 •25×4=100 •45×5=225
$\begin{array}{r} 45\\ ×_{2}4\\ \hline 180\end{array}$ $\begin{array}{r} 55\\ ×_{1}2\\ \hline 110\end{array}$ $\begin{array}{r} 25\\ ×_{2}4\\ \hline 100\end{array}$ $\begin{array}{r} 45\\ ×_{2}5\\ \hline 225\end{array}$
•728×5=3640 •126×4=504 •136×5=680 •123×8=984
$\begin{array}{r} 728\\ ×_{14}5\\ \hline 3640\end{array}$ $\begin{array}{r} 126\\ ×_{12}4\\ \hline 504\end{array}$ $\begin{array}{r} 136\\ ×_{13}5\\ \hline 680\end{array}$ $\begin{array}{r} 123\\ ×_{12}8\\ \hline 984\end{array}$
•323×6=1938 •125×4=500 •135×5=675 •125×8=1000
$\begin{array}{r} 323\\ ×_{11}6\\ \hline 1938\end{array}$ $\begin{array}{r} 125\\ ×_{12}4\\ \hline 500\end{array}$ $\begin{array}{r} 135\\ ×_{12}5\\ \hline 675\end{array}$ $\begin{array}{r} 125\\ ×_{24}8\\ \hline 1000\end{array}$