Multiplication of decimal

Šmykľavka: 1
Louise, I'm confused about decimal multiplication. Do you understand it?
No, I still don't know where the decimal goes. I hope Ms. Crezil goes over it again today.
Šmykľavka: 2
Good morning. Many students find decimal rules confusing.
Yesterday we learned about decimal multiplication.
I want to make sure you understand how to do it correctly.
Šmykľavka: 3
When we add or subtract decimals, we line them up. Do we also do this when we multiply?
Theordie?
Šmykľavka: 4
That's right, Juan. We line up the numbers and multiply like normal.
Then we count the digits to the right of the decimals in both factors.
Finally, in the product, we count from right to left the same number of places and put the decimal point there.
Šmykľavka: 5
Okay, let's try a practice problem. What is 4.21 x 3.8?
It's 15.998!
Awesome job! Can someone explain why Sheila put the decimal between the 5 and the 9?
Šmykľavka: 6
Louise?
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.
You're right! Great explanation!
Šmykľavka: 0
No, we have to line up the numbers.

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