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# Strategies for multiplying multiples of 10, 100 and 1000

Sal uses strategies, such as an understanding of place value, to multiply numbers like 800x400.

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• I like the way he teaches us! its easy and very helpful! and makes me like math better! :)
• cap? yahoo, he DOES!!
• 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.
• i like the way how teaches us it makes me inspired to go to college and learn :)
• How many braincells do i have now
• well i have a couple
• Hi!

I'm Soha and i am in fith grade. I fail every subject in my grade and i need help. Everyone calls me "Dumb". And that's right i am dumb.
• You times the first number and then add the 0s together
800x400:
8x4=32
00+00=0000
32+0000=320,000
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