Pre-Algebra Examples

Factor out a ${\displaystyle -1}$.

Multiply ${\displaystyle 4}$ by ${\displaystyle 1}$. Place the result in the next column in the result line. There is one result line for each digit in ${\displaystyle 1.4}$.

Multiply ${\displaystyle 4}$ by ${\displaystyle 6}$. Place the ones digit ${\displaystyle \left(4\right)}$ in the result line and carry the tens digit ${\displaystyle \left(2\right)}$. There is one result line for each digit in ${\displaystyle 1.4}$.

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 ${\displaystyle 1.4}$.

Multiply ${\displaystyle 1}$ by ${\displaystyle 6}$. Place the result in the next column in the result line. There is one result line for each digit in ${\displaystyle 1.4}$.

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

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

Add the numbers in each column. In this case, add ${\displaystyle 2+6}$, then place the ${\displaystyle 8}$ in the result line.

To find the number of decimal places needed in the answer, add the number of decimal places in the multiplier and multiplicand. In this case, there is a total of ${\displaystyle 2}$, so the answer must have ${\displaystyle 2}$ decimal places as well.