Multiplying 2 and 3digit numbers by a 1digit number
In a nutshell
It is common to use written methods when multiplying threedigit numbers and trickier twodigit numbers by a onedigit number, however, mental methods are still very useful.
Written methods
Short multiplication is a common written method for multiplying two and threedigit numbers by a onedigit number.
Short multiplication
Using columns to set out and calculate, short multiplication is a quick way to work out multiplication calculations.
PROCEDURE
1.  Set out the calculation:  Align the ones one below the other ones and write out the rest of the digits in columns.
 Draw a line beneath and a multiplication symbol to the left.

2.  Multiply each digit of the two/threedigit number by the single digit from right to left. 
3.  Below the line in the answer space, write the unit digit of each calculation and carry over into the next column if required. 
Example
Work out $132\times4$.
Set out the calculation.
Multiply each digit of the two/threedigit number by the single digit from right to left.
$\begin{aligned}\\&2\times4=8\\&3\times4 = 12\\&1\times4=4\end{aligned}$
Place the $8$ in the ones column.
2\times4=8
Place the $2$ in the tens column and carry the one.
Add the carried $1$ and place $5$ in the final column.
$132\times4=\underline{528}$
Note: Mental methods such as partitioning, breaking down and taking away from a round number can also be used for multiplication involving a threedigit number and a onedigit number.