Evaluate 40*40

Multiply ${\displaystyle 0}$ by ${\displaystyle 0}$. Place the result in the next column in the result line. There is one result line for each digit in ${\displaystyle 40}$.

Multiply ${\displaystyle 0}$ by ${\displaystyle 4}$. Place the result in the next column in the result line. There is one result line for each digit in ${\displaystyle 40}$.

Multiply ${\displaystyle 4}$ by ${\displaystyle 0}$. Place the result in the next column in the result line. There is one result line for each digit in ${\displaystyle 40}$.

Multiply ${\displaystyle 4}$ by ${\displaystyle 4}$. Place the ones digit ${\displaystyle \left(6\right)}$ in the result line and carry the tens digit ${\displaystyle \left(1\right)}$. There is one result line for each digit in ${\displaystyle 40}$.

Add the numbers in each column. In this case, add ${\displaystyle 0+0}$, then place the ${\displaystyle 0}$ in the result line.

Add the numbers in each column. In this case, add ${\displaystyle 0+0}$, then place the ${\displaystyle 0}$ in the result line.

Add the numbers in each column. In this case, add ${\displaystyle 0+6}$, then place the ${\displaystyle 6}$ in the result line.

Add the numbers in each column. In this case, add ${\displaystyle 0+1}$, then place the ${\displaystyle 1}$ in the result line.