Posted by hannah on Thursday, October 7, 2010 at 8:30pm.
how can you use rounding to estimate 331+193

math  Ms. Sue, Thursday, October 7, 2010 at 8:32pm
I'd add 330 and 200. Others might add 330 and 190.

math  Jen, Thursday, October 7, 2010 at 10:33pm
331+193
This depends on whether you're rounding to the nearest 10 or 100. If rounding to the nearest 10, 331 rounds to 330 and 193 rounds to 190, so then you'd do 330+190. If rounding to the nearest 100, 330 rounds to 300 and 190 rounds to 200, so then you'd do 300+200.