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Multiplication of decimal numbers
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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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