Question

Give a rough estimate (by rounding off to nearest hundreds) and also a closer estimate (by rounding off to nearest tens):
$$1,08,734-47,599$$.

Answer 1

Given number is $$1,08,734-47,599$$
Rounding off to nearest hundreds:

$$1,80,734$$ and $$47,599$$ may be rounded off to $$1,08,700$$ and $$47,600$$ respectively.
Hence,

$$108700$$
$$-47600$$
__________
$$61100$$
__________

Rounding off to nearest tens:

$$1,08,734$$ and $$47,599$$ may be rounded off to $$1,08,730$$ and $$47,600$$ respectively.
Hence,

$$108730$$
$$-47600$$
__________
$$61130$$
__________