Evaluate 81*81

Multiply ${\displaystyle 1}$ by ${\displaystyle 1}$. Place the result in the next column in the result line. There is one result line for each digit in ${\displaystyle 81}$.

Multiply ${\displaystyle 1}$ by ${\displaystyle 8}$. Place the result in the next column in the result line. There is one result line for each digit in ${\displaystyle 81}$.

Multiply ${\displaystyle 8}$ by ${\displaystyle 1}$. Place the result in the next column in the result line. There is one result line for each digit in ${\displaystyle 81}$.

Multiply ${\displaystyle 8}$ by ${\displaystyle 8}$. Place the ones digit ${\displaystyle \left(4\right)}$ in the result line and carry the tens digit ${\displaystyle \left(6\right)}$. There is one result line for each digit in ${\displaystyle 81}$.

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

Add the numbers in each column. In this case, add ${\displaystyle 8+8}$, then place the ${\displaystyle 6}$ in the result line and carry the ${\displaystyle 1}$.

Add the numbers in each column. In this case, add ${\displaystyle 0+4+1}$, then place the ${\displaystyle 5}$ 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.