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\begin{array}{c}\phantom{\times9999}456\\\underline{\times\phantom{999}4521}\\\end{array}
First line up the numbers vertically and match the places from the right like this.
\begin{array}{c}\phantom{\times9999}456\\\underline{\times\phantom{999}4521}\\\phantom{\times9999}456\\\end{array}
Now multiply the first number with the 1^{st} digit in 2^{nd} number to get intermediate results. That is Multiply 456 with 1. Write the result 456 at the end leaving 0 spaces to the right like this.
\begin{array}{c}\phantom{\times9999}456\\\underline{\times\phantom{999}4521}\\\phantom{\times9999}456\\\phantom{\times999}912\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 456 with 2. Write the result 912 at the end leaving 1 spaces to the right like this.
\begin{array}{c}\phantom{\times9999}456\\\underline{\times\phantom{999}4521}\\\phantom{\times9999}456\\\phantom{\times999}912\phantom{9}\\\phantom{\times9}2280\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 456 with 5. Write the result 2280 at the end leaving 2 spaces to the right like this.
\begin{array}{c}\phantom{\times9999}456\\\underline{\times\phantom{999}4521}\\\phantom{\times9999}456\\\phantom{\times999}912\phantom{9}\\\phantom{\times9}2280\phantom{99}\\\underline{\phantom{\times}1824\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 456 with 4. Write the result 1824 at the end leaving 3 spaces to the right like this.
\begin{array}{c}\phantom{\times9999}456\\\underline{\times\phantom{999}4521}\\\phantom{\times9999}456\\\phantom{\times999}912\phantom{9}\\\phantom{\times9}2280\phantom{99}\\\underline{\phantom{\times}1824\phantom{999}}\\\phantom{\times}2061576\end{array}
Now add the intermediate results to get final answer.