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\begin{array}{c}\phantom{\times999}345\\\underline{\times\phantom{999}674}\\\end{array}
First line up the numbers vertically and match the places from the right like this.
\begin{array}{c}\phantom{\times999}345\\\underline{\times\phantom{999}674}\\\phantom{\times99}1380\\\end{array}
Now multiply the first number with the 1^{st} digit in 2^{nd} number to get intermediate results. That is Multiply 345 with 4. Write the result 1380 at the end leaving 0 spaces to the right like this.
\begin{array}{c}\phantom{\times999}345\\\underline{\times\phantom{999}674}\\\phantom{\times99}1380\\\phantom{\times9}2415\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 345 with 7. Write the result 2415 at the end leaving 1 spaces to the right like this.
\begin{array}{c}\phantom{\times999}345\\\underline{\times\phantom{999}674}\\\phantom{\times99}1380\\\phantom{\times9}2415\phantom{9}\\\underline{\phantom{\times}2070\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 345 with 6. Write the result 2070 at the end leaving 2 spaces to the right like this.
\begin{array}{c}\phantom{\times999}345\\\underline{\times\phantom{999}674}\\\phantom{\times99}1380\\\phantom{\times9}2415\phantom{9}\\\underline{\phantom{\times}2070\phantom{99}}\\\phantom{\times}232530\end{array}
Now add the intermediate results to get final answer.