Multiplying a decimal number
Multiplying a decimal number by a single digit whole number
To multiply \(23.7\) by \(4\) without using a calculator, you can set it out like this:
- One decimal place is used in the calculation therefore the solution should also contain one decimal place. Before calculating the solution place the decimal point correctly.
- Start with \(4 \times 7\), which is \(28\), so write the \(8\) and carry the \(2\) to the units column.
- \(4 \times 3 = 12\), but remember to add the carried \(2\) to get \(14\). Write the \(4\) and carry the \(1\) to the tens column.
- \(4 \times 2 = 8\), and we add the carried \(1\) to get \(9\).
Therefore \(23 \cdot 7 \times 4 = 94 \cdot 8\)