Multiply decimals by decimals - and why the rule works

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Uploaded by on Jan 1, 2010

The rule for multiplying decimals says to put as many decimal digits in the answer as there are in the factors. I explain where this rule comes from, using fraction multiplication.

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Education

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  • i like this teacher :D :D :D :D

  • nicee videeoo my teacher recommended to me and it was fairly helpful. thanks

  • mathematical :D

  • Excellent! This is the only place I could find and explanation of the rule. I teach GED math to adults and they want to know why!

    Thanks!

  • very helpful.

  • @neverstraytoofar me too :S

  • I got lost by 0:44

  • your teaching is awsome for fifth graders

  • Love your teaching style. This is a great 4 grade refresh very useful for working adults as well. Thanks!

  • Dear Maria,

    Right now I the most recent member of your site. This is the first of your videos I have seen and with all the math teachers I have watched teach, I know you are very good.

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