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Lesson 1: Multi-digit multiplication estimation

# Strategies for multiplying multiples of 10, 100 and 1000

Learn the strategy of estimating in multi-digit multiplication. Watch how to multiply numbers expressed in hundreds, thousands, or tens. Practice this skill by multiplying numbers together and estimating the result, reinforcing their understanding of place value and multiplication.

## Want to join the conversation?

• I like the way he teaches us! its easy and very helpful! and makes me like math better! :)
• I have an A+ in math. P.s, I have 4 A+'s
• Hi. I just started 5th grade and I don't get where to put the apostrophe. Can someone help me? Thank you.
• For every 3 digits you put an apostrophe, like this: 1,000.
• After watching this video things are much clearer😃
• how do this chat thing work?
• You times the first number and then add the 0s together
800x400:
8x4=32
00+00=0000
32+0000=320,000
• why do we need the zeros
• just for the heIp
• No matter how hard I try I just cannot understand this
• Follow the steps,did you miss one or did you follow them all? If you missed one like forgetting a 0, you can get it wrong as fast as you can say; callie cat called carlos capybara. Those 0s make a difference
es: 398,012
3,980,120
it turned that hundred thousand to millions
see how easy that was?
• I'm confused its so complicated how do i do this?
(1 vote)
• Here's an example.
100 x 300.
Just multiply the first numbers.
1 x 3. That would equal 3. Then, you count how many zeros there are. So, 300 has 2 zeros. And 100 also has 2 zeros. So 2+2 is 4. Then, you put the zeros and 3 together and that will make 30,000.

Hope this helps! If it doesn't, tell me so I can maybe show you a few more examples.