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### Course: Arithmetic>Unit 16

Lesson 2: Multiplying decimals strategies

# Multiplying decimals using estimation

Learn all about multiplying decimals by using using estimation. Practice ignoring the decimals first, and multiplying the numbers as wholes. Then, use estimation to find where the decimal should go, ensuring the answer is reasonable.  Created by Sal Khan.

## Want to join the conversation?

• Can someone please simplify the process?
• Mmm... I think it's 2.8times 4.73=13.244
473
times 28
---------
3784
9460
---------
13244
Just do it on a note book, if you do much, I think it's kind of easy. Or... You can think in mind: 3times 5
(1 vote)
• Yes. Can someone please simplify the process?
(1 vote)
• First, you want to to multiply rhe decimals as if they were whole numbers, so take away the decimal points. Instead of 4.73 times 2.8, you would do 473 times 28. That is 13244. Then, you would round the decimals to whole numbers which would be 5 times 3. That is 15. Then to figure out where the decimal point would go, you would do trial and error by putting the decimal point in every possible place until you find the number that is closest to 15. Hope this helps!