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How to Multiply a Whole Number Times a Decimal

Multiplication is the process of finding the product of two or more numbers. Whole numbers are also called integers or natural numbers and represent a whole. In whole numbers, there are no decimals. They include numbers such as 1, 2, 10, 15 and 1,000. A decimal is a number that contains a partial number within it, such as 1.22 or 0.34. When you multiply a whole number by a decimal, you must ignore the decimal and use standard multiplication. After you complete the problem, you must then take the decimal into consideration.

Instructions

- 1
  Multiply 210 times 0.1234. Line up the numbers on the right side and ignore the decimal point prior to multiplying.
- 2
  Multiply each number from the second number with each number from the first from right to left. For example, in this problem, multiply the 4 times 0, which equals 0. Multiply the 4 times 1 to get 4 and multiply the 4 times 2 to get 8. The first row of the answer is 840.
- 3
  Multiply 210 by the second number from the right, which is a 3. Place a zero in the right-hand column first, though. After working this row, the answer for this row is. 6,300.
- 4
  Complete the next two rows. The answers for the next two rows are 42000 and 210000.
- 5
  Add up all four answers. The total is 259142.
- 6
  Count the number of decimal places. Look at the decimal number in this problem, which is 0.1234. Using this example, there are four decimal places.
- 7
  Write in the decimal point. In this example, the answer is 25.9142.

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