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  • Isabella, I'm confused about decimal multiplication. Do you understand it?
  • No, I still don't know where the decimal goes. I hope Ms. Resnick goes over it again today.
  • Yesterday we learned about decimal multiplication.
  • Good morning. Many students find decimal rules confusing.
  • I want to make sure you understand how to do it correctly.
  • When we add or subtract decimals, we line them up. Do we also do this when we multiply?
  • Juan?
  • No, we have to line up the numbers.
  • Finally, in the product, we count from right to left the same number of places and put the decimal point there.
  • Then we count the digits to the right of the decimals in both factors.
  • That's right, Juan. We line up the numbers and multiply like normal. 
  • Okay, let's try a practice problem. What is 4.21 x 3.8?
  • Awesome job! Can someone explain why Laila put the decimal between the 5 and the 9?
  • It's 15.998!
  • Isabella?
  • You're right! Great explanation!
  • I get it now! There are 3 digits to the right of the factors, so we have to move the decimal point 3 places to the left in the product.
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