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Lesson 5: Multiply with partial products

# Multiplying 3-digit by 1-digit

Learn to multiply a 3-digit number by a 1-digit number without regrouping.  In this video, we will multiply 4x201. Created by Sal Khan.

## Want to join the conversation?

• 201x4... easy! 1.Just multiply 200x4 2. Then multiply 4x1 3. Last add the products 800+4=804

I hope this helps
• Hi
is it always just me or are the videos easy but the test are really hard.

see you next time!
• agreed definatly
• Has anyone ever heard of lattice multipliation?
• I don't know what is "lattice multiplication".
• Hi!

My question is pretty random, but can you ÷ using the same standered way we're using?
I know it works for addition, subtration and multiplacation!

Thanks!
• yes you can :D
• great job!but i still cant figure 1*1?
• Any number multiplied by 1 is the number itself. So 1*1 = 1, 1*2 = 2, 1*3 = 3, and so on. If you are a visual learner then think of it like this: if you have one group of strawberries and that group has one strawberry in it then how many strawberries are there? The answer is 1.
• Do we Always have to put the bigger number on top
• At you said that 800 + 0 + 4 is 804. That is correct, but what is the reason to say 800 + 0 + 4 if the 0 doesn't have any value?