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\begin{array}{c}\phantom{\times999}2921\\\underline{\times\phantom{999}1087}\\\end{array}
First line up the numbers vertically and match the places from the right like this.
\begin{array}{c}\phantom{\times999}2921\\\underline{\times\phantom{999}1087}\\\phantom{\times99}20447\\\end{array}
Now multiply the first number with the 1^{st} digit in 2^{nd} number to get intermediate results. That is Multiply 2921 with 7. Write the result 20447 at the end leaving 0 spaces to the right like this.
\begin{array}{c}\phantom{\times999}2921\\\underline{\times\phantom{999}1087}\\\phantom{\times99}20447\\\phantom{\times9}23368\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 2921 with 8. Write the result 23368 at the end leaving 1 spaces to the right like this.
\begin{array}{c}\phantom{\times999}2921\\\underline{\times\phantom{999}1087}\\\phantom{\times99}20447\\\phantom{\times9}23368\phantom{9}\\\phantom{\times99999}0\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 2921 with 0. Write the result 0 at the end leaving 2 spaces to the right like this.
\begin{array}{c}\phantom{\times999}2921\\\underline{\times\phantom{999}1087}\\\phantom{\times99}20447\\\phantom{\times9}23368\phantom{9}\\\phantom{\times99999}0\phantom{99}\\\underline{\phantom{\times}2921\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 2921 with 1. Write the result 2921 at the end leaving 3 spaces to the right like this.
\begin{array}{c}\phantom{\times999}2921\\\underline{\times\phantom{999}1087}\\\phantom{\times99}20447\\\phantom{\times9}23368\phantom{9}\\\phantom{\times99999}0\phantom{99}\\\underline{\phantom{\times}2921\phantom{999}}\\\phantom{\times}3175127\end{array}
Now add the intermediate results to get final answer.