Question
To solve 18 x 20
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Answer to a math question To solve 18 x 20
Corbin
4.6106 Answers
Multiply the top number by the bolded digit of the bottom number
$\begin{matrix}\:\:&\bold{1}&\bold{8}\\\times &2&\bold{0}\end{matrix}$
Mutliply the bold numbers $8\times 0=0$
$\frac{\begin{matrix}\:\:&1&\bold{8}\\\times &2&\bold{0}\end{matrix}}{\begin{matrix}\:\:&\:\:&0\end{matrix}}$
Mutliply the bold numbers $1\times 0=0$
$\frac{\begin{matrix}\:\:&\bold{1}&8\\\times &2&\bold{0}\end{matrix}}{\begin{matrix}\:\:&0&0\end{matrix}}$
Multiply the top number by the bolded digit of the bottom number
$\frac{\begin{matrix}\:\:&\bold{1}&\bold{8}\\\times &\bold{2}&0\end{matrix}}{\begin{matrix}\:\:&0&0\end{matrix}}$
Mutliply the bold numbers $8\times 2=16$
$\frac{\begin{matrix}\:\:&\:\:&1&\:\:\\\:\:&\:\:&1&\bold{8}\\\:\:&\times &\bold{2}&0\end{matrix}}{\begin{matrix}\:\:&\:\:&0&0\\\:\:&\:\:&6&\:\:\end{matrix}}$
Add the carried number to the multiplication $1+1\times 2=3$
$\frac{\begin{matrix}\:\:&\:\:&\bold{1}&\:\:\\\:\:&\:\:&\bold{1}&8\\\:\:&\times &\bold{2}&0\end{matrix}}{\begin{matrix}\:\:&\:\:&0&0\\\:\:&3&6&\:\:\end{matrix}}$
Add the rows to get the answer. For simplicity, fill in trailing zeros
$\frac{\begin{matrix}\:\:&\:\:&1&8\\\:\:&\times &2&0\end{matrix}}{\begin{matrix}\:\:&0&0&0\\\:\:&3&6&0\end{matrix}}$
Line up the numbers
$\begin{matrix}\:\:&1&8\\\times &2&0\end{matrix}$
$=360$
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