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\begin{array}{c}\phantom{\times9999}14142\\\underline{\times\phantom{9999}14142}\\\end{array}
First line up the numbers vertically and match the places from the right like this.
\begin{array}{c}\phantom{\times9999}14142\\\underline{\times\phantom{9999}14142}\\\phantom{\times9999}28284\\\end{array}
Now multiply the first number with the 1^{st} digit in 2^{nd} number to get intermediate results. That is Multiply 14142 with 2. Write the result 28284 at the end leaving 0 spaces to the right like this.
\begin{array}{c}\phantom{\times9999}14142\\\underline{\times\phantom{9999}14142}\\\phantom{\times9999}28284\\\phantom{\times999}56568\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 14142 with 4. Write the result 56568 at the end leaving 1 spaces to the right like this.
\begin{array}{c}\phantom{\times9999}14142\\\underline{\times\phantom{9999}14142}\\\phantom{\times9999}28284\\\phantom{\times999}56568\phantom{9}\\\phantom{\times99}14142\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 14142 with 1. Write the result 14142 at the end leaving 2 spaces to the right like this.
\begin{array}{c}\phantom{\times9999}14142\\\underline{\times\phantom{9999}14142}\\\phantom{\times9999}28284\\\phantom{\times999}56568\phantom{9}\\\phantom{\times99}14142\phantom{99}\\\phantom{\times9}56568\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 14142 with 4. Write the result 56568 at the end leaving 3 spaces to the right like this.
\begin{array}{c}\phantom{\times9999}14142\\\underline{\times\phantom{9999}14142}\\\phantom{\times9999}28284\\\phantom{\times999}56568\phantom{9}\\\phantom{\times99}14142\phantom{99}\\\phantom{\times9}56568\phantom{999}\\\underline{\phantom{\times}14142\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 14142 with 1. Write the result 14142 at the end leaving 4 spaces to the right like this.
\begin{array}{c}\phantom{\times9999}14142\\\underline{\times\phantom{9999}14142}\\\phantom{\times9999}28284\\\phantom{\times999}56568\phantom{9}\\\phantom{\times99}14142\phantom{99}\\\phantom{\times9}56568\phantom{999}\\\underline{\phantom{\times}14142\phantom{9999}}\\\phantom{\times}199996164\end{array}
Now add the intermediate results to get final answer.