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## Arithmetic

### Course: Arithmetic>Unit 14

Lesson 2: Multi-digit multiplication

# Intro to standard way of multiplying multi-digit numbers

The standard algorithm for multiplying a multi-digit number by a single digit number involves multiplying each place value by the single digit, and regrouping as necessary. This method is equivalent to breaking the multi-digit number into parts, multiplying each part by the single digit, and adding the results together. Created by Sal Khan.

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• why so much multi
• help i accidently made an ikea again trying to solve this
• I'm only in 4th grade and I shared this method to my friends.
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• Why this algorithm? My teacher tought me one other and this worked for me many times before.
(1 vote)
• Unless your teacher requires you to use a certain algorithm, it is best to choose the algorithm you are most comfortable with. You may want to use two algorithms (or an algorithm and a shortcut trick) to check your answer.