Posted by **dk** 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 -
**bobpursley**, Thursday, January 20, 2011 at 6:39pm
what is 50x400?

- 4th grade -
**dk**, Thursday, January 20, 2011 at 7:24pm
20,000

- 4th grade -
**Ms. Sue**, 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 -
**christina manley**, Wednesday, February 2, 2011 at 8:37pm
the world in the 1400s

- 4th grade -
**Juan**, 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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