Wykonajmy obliczenia.

a)

$\begin{array}{r}41\\ \underline{\cdot 16}\\ 246\\ \underline{+41}\\ 656\end{array}$

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b)

$\begin{array}{r}57\\ \underline{\cdot 13}\\ 171\\ \underline{+57}\\ 741\end{array}$

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c)

$\begin{array}{r}518\\ \underline{\cdot 22}\\ 1036\\ \underline{+1036}\\ 11396\end{array}$

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d)

$\begin{array}{r}347\\ \underline{\cdot 94}\\ 1388\\ \underline{+3123}\\ 32618\end{array}$

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e)

$\begin{array}{r}508\\ \underline{\cdot 34}\\ 2032\\ \underline{+1524}\\ 17272\end{array}$

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f)

$\begin{array}{r}831\\ \underline{\cdot 135}\\ 4155\\ 2493\\ \underline{+831}\\ 112185\end{array}$

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g)

$\begin{array}{r}937\\ \underline{\cdot 407}\\ 6559\\ \underline{+3748}\\ 381359\end{array}$

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h)

$\begin{array}{r}509\\ \underline{\cdot 806}\\ 3054\\ \underline{+4072}\\ 410254\end{array}$

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i)

Najpierw wykonajmy mnożenie z pominięciem zer na końcu, a następnie dopiszemy je w wyniku.

$\begin{array}{r}78\\ \underline{\cdot 32}\\ 156\\ \underline{+234}\\ 2496\end{array}$

A więc:

$780\cdot 3200=2496000$

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j)

$\begin{array}{r}127\\ \underline{\cdot 208}\\ 1016\\ \underline{+254}\\ 26416\end{array}$

A więc:

$1270\cdot 2080=2614600$

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k)

$\begin{array}{r}451\\ \underline{\cdot 306}\\ 2706\\ \underline{+1353}\\ 138006\end{array}$

A więc:

$4510\cdot 3060=13800600$

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l)

$\begin{array}{r}345\\ \underline{\cdot 72}\\ 690\\ \underline{+2415}\\ 24840\end{array}$

A więc:

$34500\cdot 7200=248400000$

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m)

Potęgowanie możemy zastąpić mnożeniem:

$24^2=24\cdot 24$

$\begin{array}{r}24\\ \underline{\cdot 24}\\ 96\\ \underline{+48}\\ 576\end{array}$

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n)

$\begin{array}{r}21\\ \underline{\cdot 21}\\ 21\\ \underline{+42}\\ 441\end{array}$

A więc:

$210\cdot 210=44100$

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o)

$9^3=9\cdot 9\cdot 9=81\cdot 9$

$\begin{array}{r}81\\ \underline{\cdot 9}\\ 729\end{array}$

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p)

$80^3=80\cdot 80\cdot 80=6400\cdot 80=512000$

$\begin{array}{r}64\\ \underline{\cdot 8}\\ 512\end{array}$