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# Multiplying 3-digit by 1-digit (regrouping)

Learn to multiply a 3-digit number by a 1-digit number using regrouping.  In this video, we will multiply 7x253. Created by Sal Khan.

## Want to join the conversation?

• okay so a lot of people say that the new way of this generation's math is very easy but it is actually very complicated. The old way is a lot easier so you schools that are doing great1
• I agree. It is very hard! I hope Sal Khan fixes it to be easier.
• Has anyone ever wondered 4 digit by 4 digit
• not really
• did anyone else notice that he said one thousand seven hundred AND seventy one? The proper grammar is one thousand seven hundred seventy one.
• yeah i noticed that as well i'm kinda surprised he made that mistake since hes the one teaching us grammar
• how do you solve it with 10 digits?//
• What do you mean by 10 digits? Multiple 10 digits with 10 digits?
• What is the biggest number's name like maybe 99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999 is the biggest?
• What is 305 x 6?
• first
Multiply 300 by 6 which is 1800. Now you know your answer is at least 1800.
Next multiply 6 by the remaining number 05 which same as 5. 3x5 is 30. Add your two answers and you'll get 1830 :)
• why are all these comments so long ag
• why do you put the biger number out and the low number in ?
• Just like Addition and Subtraction Regrouping/Carrying sums you're writing the numbers under the correct Place Value.

When Multiplying the Ones place wright the Ones under the Ones Place then move the 10 over to the Tens Place, Multiplying the Tens Place wright the Tens under the Tens Place and move the Hundreds over to the Hundreds Place :)

Remember in these Multiplication Regrouping/Carrying Sums to Multiply the number in the Place Value first before adding onto it the number you moved over.
(1 vote)
• Why do you have to multiply each digit by the ones place?