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7841X9

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Mutliply the bold numbers $1\times 9=9$
$\frac{\begin{matrix}\:\:&7&8&4&\bold{1}\\\times &\:\:&\:\:&\:\:&\bold{9}\end{matrix}}{\begin{matrix}\:\:&\:\:&\:\:&\:\:&9\end{matrix}}$

Mutliply the bold numbers $4\times 9=36$
$\frac{\begin{matrix}\:\:&\:\:&3&\:\:&\:\:\\\:\:&7&8&\bold{4}&1\\\times &\:\:&\:\:&\:\:&\bold{9}\end{matrix}}{\begin{matrix}\:\:&\:\:&\:\:&6&9\end{matrix}}$

Add the carried number to the multiplication $3+8\times 9=75$
$\frac{\begin{matrix}\:\:&7&\bold{3}&\:\:&\:\:\\\:\:&7&\bold{8}&4&1\\\times &\:\:&\:\:&\:\:&\bold{9}\end{matrix}}{\begin{matrix}\:\:&\:\:&5&6&9\end{matrix}}$

Add the carried number to the multiplication $7+7\times 9=70$
$\frac{\begin{matrix}\:\:&7&\bold{7}&3&\:\:&\:\:\\\:\:&\:\:&\bold{7}&8&4&1\\\times &\:\:&\:\:&\:\:&\:\:&\bold{9}\end{matrix}}{\begin{matrix}\:\:&\:\:&0&5&6&9\end{matrix}}$

Add the carried digit, $7$ , to the result
$\frac{\begin{matrix}\:\:&7&7&3&\:\:&\:\:\\\:\:&\:\:&7&8&4&1\\\times &\:\:&\:\:&\:\:&\:\:&9\end{matrix}}{\begin{matrix}\:\:&7&0&5&6&9\end{matrix}}$

Line up the numbers
$\begin{matrix}\:\:&7&8&4&1\\\times &\:\:&\:\:&\:\:&9\end{matrix}$
$=70569$

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