Place the numbers in a column, with the number containing more digits on top of the other, and align the numbers to the right, not according to the decimal point (See Reference 1). For example, write 35.7 x 28 as follows:
35.7
x 28
-------
Ignore the decimal point and multiply each digit in the bottom number with each digit in the top number starting from the right, like you would when multiplying two whole numbers. If the whole number is higher than a single digit, you will have two or more products. Align the products so that the last digit of each product is in line with the appropriate digit in the second number of the multiplication problem, as in the following example:
35.7
x 28
-------
2856
714
Add the products, as in the following example:
35.7
x 28
-------
2856
714
-------
9996
If the whole number is a single digit, you can skip this calculation.
Move the decimal point, starting from the right of the final answer, according to the number of decimal places in the decimal number being multiplied. For example, in the problem 35.7 x 28, the decimal number contains one decimal place, so you would move the decimal point one place from the right of the final answer. Therefore, 35.7 x 28 = 999.6.