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Multiplying Decimals

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Multiplying Decimals

  1. 1. Multiplying Decimals 10/19/09
  2. 2. How It Works <ul><li>Multiplying decimals is exactly the same as multiplying whole numbers. You just have to put the decimal in the right place. For example: 3.4 x 4.2 </li></ul><ul><li>Simply multiply the numbers the same way you would if they were 34 and 42. Then….. </li></ul>
  3. 3. <ul><li>Count how many numbers TOTAL are behind the decimal in the problem. In this case, there are 2. So in your product, count 2 numbers from the right and put your decimal there. 3.4 x 4.2 = 14.28  two numbers behind the decimal! </li></ul>
  4. 4. Examples <ul><li>4.5 x 0.5 </li></ul><ul><ul><li>Step 1: Multiply the top number by 5. </li></ul></ul><ul><ul><li>Step 2: Insert the place holder in the ones place for your next product. Multiply the top number by 0. </li></ul></ul><ul><ul><li>Step 3: Add. </li></ul></ul><ul><ul><li>Step 4: Count the total amount of numbers behind the decimal in the problem (it’s 2). </li></ul></ul><ul><ul><li>Step 5: Insert your decimal where it’s needed. </li></ul></ul><ul><li>Answer = 2.25 </li></ul>
  5. 5. Examples <ul><li>7 x 3.72 </li></ul><ul><ul><li>Step 1: Multiply 7 by 2. </li></ul></ul><ul><ul><li>Step 2: Insert place holder in the ones place for the next product. </li></ul></ul><ul><ul><li>Step 3: Multiply 7 by 7. </li></ul></ul><ul><ul><li>Step 4: Insert place holder in the ones and tens place for the next product. </li></ul></ul><ul><ul><li>Step 5: Multiply 7 by 3. </li></ul></ul><ul><ul><li>Step 6: Add. </li></ul></ul><ul><ul><li>Step 7: Count the total amount of numbers behind the decimal in the problem. </li></ul></ul><ul><ul><li>Step 8: Insert the decimal where needed. </li></ul></ul>

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