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\begin{array}{c}\phantom{\times999}17910\\\underline{\times\phantom{9999}1517}\\\end{array}
First line up the numbers vertically and match the places from the right like this.
\begin{array}{c}\phantom{\times999}17910\\\underline{\times\phantom{9999}1517}\\\phantom{\times99}125370\\\end{array}
Now multiply the first number with the 1^{st} digit in 2^{nd} number to get intermediate results. That is Multiply 17910 with 7. Write the result 125370 at the end leaving 0 spaces to the right like this.
\begin{array}{c}\phantom{\times999}17910\\\underline{\times\phantom{9999}1517}\\\phantom{\times99}125370\\\phantom{\times99}17910\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 17910 with 1. Write the result 17910 at the end leaving 1 spaces to the right like this.
\begin{array}{c}\phantom{\times999}17910\\\underline{\times\phantom{9999}1517}\\\phantom{\times99}125370\\\phantom{\times99}17910\phantom{9}\\\phantom{\times9}89550\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 17910 with 5. Write the result 89550 at the end leaving 2 spaces to the right like this.
\begin{array}{c}\phantom{\times999}17910\\\underline{\times\phantom{9999}1517}\\\phantom{\times99}125370\\\phantom{\times99}17910\phantom{9}\\\phantom{\times9}89550\phantom{99}\\\underline{\phantom{\times}17910\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 17910 with 1. Write the result 17910 at the end leaving 3 spaces to the right like this.
\begin{array}{c}\phantom{\times999}17910\\\underline{\times\phantom{9999}1517}\\\phantom{\times99}125370\\\phantom{\times99}17910\phantom{9}\\\phantom{\times9}89550\phantom{99}\\\underline{\phantom{\times}17910\phantom{999}}\\\phantom{\times}27169470\end{array}
Now add the intermediate results to get final answer.