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Decimal multiplication

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Sarah Hallum

This document provides steps for multiplying decimals by moving the decimal point. It explains that you count the number of decimal places in each number being multiplied, add them together to get the total decimal places, multiply the numbers, and then move the decimal point the total number of places to the left in the answer. It includes examples of multiplying decimals with different numbers of decimal places and provides a practice worksheet for additional practice.

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Moving the decimal point during decimal multiplication
Moving the decimal pointStep 1: Count how many numbers to the right of the decimal for the top number. Move the blue oval to see if you are correct..1 2 3x 2.43 decimal places3 decimal places
Moving the decimal pointStep 2: Count how many numbers to the right of the decimal on the bottom number. Move the blue oval to see if you are correct..1 2 3x 2.43 decimal places1 decimal place
Moving the decimal pointStep 3: Add the total decimal places together. Move the oval to see if you have the correct answer..1 2 3x 2.43 decimal places+1 decimal place4 decimal places
Moving the decimal pointStep 4: Multiply. Move the oval to see if you are correct..1 2 3x 2.43 decimal places+1 decimal place2 9 5 24 decimal places
Moving the decimal pointStep 5: Move the decimal to the left the number you found earlier. Move the oval to see if you are correct..1 2 3x 2.43 decimal places+1 decimal place.2 9 5 24 decimal places
Now, let's practice!1. .6 8 x . 2 . 1 3 62. 6 . 8 x . 2 1 . 3 63. 6 8 x . 2 1 3 . 64. .6 8 x 2 1 . 3 6
Let's Assess
Decimal multiplication
Let's do independent practice!PRACTICE
AttachmentsDecimal practice(2).doc

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Decimal multiplication

  • 1. Moving the decimal point during decimal multiplication
  • 2. Moving the decimal pointStep 1: Count how many numbers to the right of the decimal for the top number. Move the blue oval to see if you are correct..1 2 3x 2.43 decimal places3 decimal places
  • 3. Moving the decimal pointStep 2: Count how many numbers to the right of the decimal on the bottom number. Move the blue oval to see if you are correct..1 2 3x 2.43 decimal places1 decimal place
  • 4. Moving the decimal pointStep 3: Add the total decimal places together. Move the oval to see if you have the correct answer..1 2 3x 2.43 decimal places+1 decimal place4 decimal places
  • 5. Moving the decimal pointStep 4: Multiply. Move the oval to see if you are correct..1 2 3x 2.43 decimal places+1 decimal place2 9 5 24 decimal places
  • 6. Moving the decimal pointStep 5: Move the decimal to the left the number you found earlier. Move the oval to see if you are correct..1 2 3x 2.43 decimal places+1 decimal place.2 9 5 24 decimal places
  • 7. Now, let's practice!1. .6 8 x . 2 . 1 3 62. 6 . 8 x . 2 1 . 3 63. 6 8 x . 2 1 3 . 64. .6 8 x 2 1 . 3 6
  • 10. Let's do independent practice!PRACTICE