Question

Give a rough estimate(by rounding off to nearest hundreds) and also a closer estimate(by rounding off to nearest tens):
$$439+334+4,317$$.

Answer 1

$$439+334+4317$$
Rounding off to nearest hundreds, $$439, 334$$ and $$4317$$ may be rounded off to $$400$$,
$$300$$ and $$4300$$ respectively.
$$400$$
$$300$$
$$+4300$$
________
$$5000$$
_________
Rounding off to nearest tens, $$439, 334$$ and $$4317$$ may be rounded off to $$440, 330$$ and $$4320$$ respectively.
$$440$$
$$330$$
$$+4320$$
________
$$5090$$
________