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Posted by on Thursday, January 20, 2011 at 6:38pm.

without multiplying, how do you know that the product of 399 and 48 is smaller than 20,722?

  • 4th grade - , Thursday, January 20, 2011 at 6:39pm

    what is 50x400?

  • 4th grade - , Thursday, January 20, 2011 at 7:24pm

    20,000

  • 4th grade - , Thursday, January 20, 2011 at 7:30pm

    Since 399 is less than 400 and 48 is less than 50, then obviously the answer must be less than 20,000. Right?

  • social studies - , Wednesday, February 2, 2011 at 8:37pm

    the world in the 1400s

  • 4th grade - , Thursday, October 11, 2012 at 9:09pm

    how can you show without multiplying that 4/9 is greater then 0.4

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