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\begin{array}{c}\phantom{\times9}150\\\underline{\times\phantom{99}21}\\\end{array}
First line up the numbers vertically and match the places from the right like this.
\begin{array}{c}\phantom{\times9}150\\\underline{\times\phantom{99}21}\\\phantom{\times9}150\\\end{array}
Now multiply the first number with the 1^{st} digit in 2^{nd} number to get intermediate results. That is Multiply 150 with 1. Write the result 150 at the end leaving 0 spaces to the right like this.
\begin{array}{c}\phantom{\times9}150\\\underline{\times\phantom{99}21}\\\phantom{\times9}150\\\underline{\phantom{\times}300\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 150 with 2. Write the result 300 at the end leaving 1 spaces to the right like this.
\begin{array}{c}\phantom{\times9}150\\\underline{\times\phantom{99}21}\\\phantom{\times9}150\\\underline{\phantom{\times}300\phantom{9}}\\\phantom{\times}3150\end{array}
Now add the intermediate results to get final answer.