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\begin{array}{c}\phantom{\times99999}20\\\underline{\times\phantom{99}58319}\\\end{array}
First line up the numbers vertically and match the places from the right like this.
\begin{array}{c}\phantom{\times99999}20\\\underline{\times\phantom{99}58319}\\\phantom{\times9999}180\\\end{array}
Now multiply the first number with the 1^{st} digit in 2^{nd} number to get intermediate results. That is Multiply 20 with 9. Write the result 180 at the end leaving 0 spaces to the right like this.
\begin{array}{c}\phantom{\times99999}20\\\underline{\times\phantom{99}58319}\\\phantom{\times9999}180\\\phantom{\times9999}20\phantom{9}\\\end{array}
Now multiply the first number with the 2^{nd} digit in 2^{nd} number to get intermediate results. That is Multiply 20 with 1. Write the result 20 at the end leaving 1 spaces to the right like this.
\begin{array}{c}\phantom{\times99999}20\\\underline{\times\phantom{99}58319}\\\phantom{\times9999}180\\\phantom{\times9999}20\phantom{9}\\\phantom{\times999}60\phantom{99}\\\end{array}
Now multiply the first number with the 3^{rd} digit in 2^{nd} number to get intermediate results. That is Multiply 20 with 3. Write the result 60 at the end leaving 2 spaces to the right like this.
\begin{array}{c}\phantom{\times99999}20\\\underline{\times\phantom{99}58319}\\\phantom{\times9999}180\\\phantom{\times9999}20\phantom{9}\\\phantom{\times999}60\phantom{99}\\\phantom{\times9}160\phantom{999}\\\end{array}
Now multiply the first number with the 4^{th} digit in 2^{nd} number to get intermediate results. That is Multiply 20 with 8. Write the result 160 at the end leaving 3 spaces to the right like this.
\begin{array}{c}\phantom{\times99999}20\\\underline{\times\phantom{99}58319}\\\phantom{\times9999}180\\\phantom{\times9999}20\phantom{9}\\\phantom{\times999}60\phantom{99}\\\phantom{\times9}160\phantom{999}\\\underline{\phantom{\times}100\phantom{9999}}\\\end{array}
Now multiply the first number with the 5^{th} digit in 2^{nd} number to get intermediate results. That is Multiply 20 with 5. Write the result 100 at the end leaving 4 spaces to the right like this.
\begin{array}{c}\phantom{\times99999}20\\\underline{\times\phantom{99}58319}\\\phantom{\times9999}180\\\phantom{\times9999}20\phantom{9}\\\phantom{\times999}60\phantom{99}\\\phantom{\times9}160\phantom{999}\\\underline{\phantom{\times}100\phantom{9999}}\\\phantom{\times}1166380\end{array}
Now add the intermediate results to get final answer.