Multiplying by a two digit whole number
To multiply \(237\) by \(24\) without using a calculator, you can set it out like this:
The first line of the calculation is the same procedure as multiplying with a single digit number.
In the second line we are multiplying by \(20\) (two tens). As we are multiplying by tens the unit's digit will always be a zero.
In a similar procedure to above:\(2 \times 7 = 14\). Put the \(4\) in the tens column and carry the \(1\) to the hundreds column.
\(2 \times 3 = 6\): add the carried \(1\) to get \(7\) and put this in the hundreds column.
\(2 \times 2 = 4\): nothing has been carried so put the \(4\) in the thousands column.
Add \(948\) and \(4740\).
Therefore \(237 \times 24 = 5\,688\)
