On February 17, 2014 at 23:33, Fins said...
I know how to round off. But what I'm undecided on is if they would expect a 3rd grader to think advanced enough to consider 0 a hundreds place.
You do algebra in Kindergarten.
2+_=4, 3-_ = 1, 9+_=10.
That's all the simplest algebra ever, but we don't teach it as algebra.
