Evaluate 4*25

Multiply ${\displaystyle 5}$ by ${\displaystyle 4}$. Place the ones digit ${\displaystyle \left(0\right)}$ in the result line and carry the tens digit ${\displaystyle \left(2\right)}$. There is one result line for each digit in ${\displaystyle 25}$.

Multiply ${\displaystyle 2}$ by ${\displaystyle 4}$. Place the result in the next column in the result line. There is one result line for each digit in ${\displaystyle 25}$.

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 ${\displaystyle 2+8}$, then place the ${\displaystyle 0}$ in the result line and carry the ${\displaystyle 1}$.