Multiplying and dividing decimals
The importance of multiplying and dividing decimals
Steps to dividing decimals
multiplying and dividing deciamls video
To multiply decimals:
- Ignore the decimal points and multiply as you would whole numbers.
- Count the number of decimal digits (the digits to the right of the decimal point) in both of the numbers you multiplied.
- Beginning at the right side of the product (the answer), count left that number of digits, and put the decimal point to the left of the last digit you counted.
Example: 1.57 × 2.4
1.Multiply 157 times 24: 3768
2.Because there are a total of three decimal digits in 1.57 and 2.4, count off 3 places from the right in 3768 and place the decimal point to the left of the third digit you counted (7):
To check the reasonableness of your work, estimate the product by using the rounding technique you learned in Lesson 6. Round each number you multiplied to the nearest whole number, and then multiply the results. If the product is close to your answer, your answer is in the ballpark. Otherwise, you may have made a mistake in placing the decimal point or in multiplying. Rounding 1.57 and 2.4 to the nearest whole numbers gives you 2 and 2. Their product is 4, which is close to your answer. Thus, your actual answer of 3.768 seems reasonable.