A number can be multiplied to two decimal places by a single-digit whole number or by multiples of 10, 100 and 1000 using a standard written format and without a calculator.

To multiply by without using a calculator, you can set it out like this:

- Start with , which is , so write the and carry the to the tens column.
- , but remember to add the carried to get . Write the and carry the to the hundreds column.
- , and we add the carried to get .

Therefore

To multiply by 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 (two tens). As we are multiplying by tens the unit's digit will always be a zero.
- In a similar procedure to above:- . Put the in the tens column and carry the to the hundreds column.
- - add the carried to get and put this in the hundreds column.
- , nothing has been carried so put the in the thousands column.
- Add and .

Therefore