Evaluate 55*55

Multiply ${\displaystyle 5}$ by ${\displaystyle 5}$. Place the ones digit ${\displaystyle \left(5\right)}$ in the result line and carry the tens digit ${\displaystyle \left(2\right)}$. There is one result line for each digit in ${\displaystyle 55}$.

Multiply ${\displaystyle 5}$ by ${\displaystyle 5}$ and add the carried ${\displaystyle 2}$. Place the ones digit ${\displaystyle \left(7\right)}$ in the result line and carry the tens digit ${\displaystyle \left(2\right)}$. There is one result line for each digit in the ${\displaystyle 55}$.

Multiply ${\displaystyle 5}$ by ${\displaystyle 5}$. Place the ones digit ${\displaystyle \left(5\right)}$ in the result line and carry the tens digit ${\displaystyle \left(2\right)}$. There is one result line for each digit in ${\displaystyle 55}$.

Multiply ${\displaystyle 5}$ by ${\displaystyle 5}$ and add the carried ${\displaystyle 2}$. Place the ones digit ${\displaystyle \left(7\right)}$ in the result line and carry the tens digit ${\displaystyle \left(2\right)}$. There is one result line for each digit in the ${\displaystyle 55}$.

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

Add the numbers in each column. In this case, add ${\displaystyle 7+5}$, then place the ${\displaystyle 2}$ in the result line and carry the ${\displaystyle 1}$.

Add the numbers in each column. In this case, add ${\displaystyle 2+7+1}$, then place the ${\displaystyle 0}$ in the result line and carry the ${\displaystyle 1}$.

Add the numbers in each column. In this case, add ${\displaystyle 0+2+1}$, then place the ${\displaystyle 3}$ in the result line.