Evaluate 23*4

Multiply ${\displaystyle 4}$ by ${\displaystyle 3}$. Place the ones digit ${\displaystyle \left(2\right)}$ in the result line and carry the tens digit ${\displaystyle \left(1\right)}$. There is one result line for each digit in ${\displaystyle 4}$.

Multiply ${\displaystyle 4}$ by ${\displaystyle 2}$ and add the carried ${\displaystyle 1}$. Place the result in the next column in the result line. There is one result line for each digit in ${\displaystyle 4}$.

Add the numbers in each column. In this case, add ${\displaystyle 2}$, then place the ${\displaystyle 2}$ in the result line.

Add the numbers in each column. In this case, add ${\displaystyle 9}$, then place the ${\displaystyle 9}$ in the result line.