Evaluate 42*7

Multiply ${\displaystyle 7}$ by ${\displaystyle 2}$. Place the ones digit ${\displaystyle \left(4\right)}$ in the result line and carry the tens digit ${\displaystyle \left(1\right)}$. There is one result line for each digit in ${\displaystyle 7}$.

Multiply ${\displaystyle 7}$ by ${\displaystyle 4}$ and add the carried ${\displaystyle 1}$. Place the ones digit ${\displaystyle \left(9\right)}$ in the result line and carry the tens digit ${\displaystyle \left(2\right)}$. There is one result line for each digit in the ${\displaystyle 7}$.

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

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