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## MAP Recommended Practice

### Course: MAP Recommended Practice>Unit 34

Lesson 34: Multiplying decimals strategies

# Understanding decimal multiplication

Sal uses estimation to understand where to place decimals in the product of a decimal multiplication problem. Created by Sal Khan.

## Want to join the conversation?

• pls upvote me
• im in 5 grade and this easy
• please someone help me this is so hard. I can't do this cause teachers tell me different my fourth grade teacher told me a different way and how this tricky. My compacted math teacher in fifth grade said to do it like this esay. sadness
• It's kind of easy in a few cases. For example, the first question, all of the decimals are placed at different places and as the decimal goes to the right, it is multiplied by 10, 100. . . . As we go to the left, it gets divided by 10, 10. . . . So when we are multiplying, (since they already gave the product) we will add the decimal points on the location of where it is (like, if the decimal point is after 2 digits in the ques., it will be after 2 digits in the answer too). It also depends on how many nos. have the decimal points. If both numbers have it, then you just have to add up the points (for e.g.- 0.52x 76.2= 39.624, since both numbers add up to have decimal pints after 3 places). Hope this helps :D
• I do not get it
• how does sal not realize that he put them in the right spots when he moved then 0-0
• what does he mean?
• well, he is saying that 76.2 can be rounded to 76 I like to think of it as a whole number so 76.2 becomes 762 and i think to round it to the nearest ten so that be comes 760 the I make it a decimal and were done.